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29mm Carbo AirBlocks

29mm Carbo AirBlocks

The 29 mm Carbo block is compact block and extremely strong. Great for uses such as outhauls, cunninghams, vangs, traveler controls, barberhaulers and flag halyards. The miniature Carbo works well as a mainsheet block on small dinghies such as the Optimist, or for low-friction control blocks on any size boat.

Doubles and triples feature U-Locks to hold the swivel in front/side position, or to let it spin freely. The triple’s compact cam arm supports high-load purchases of 5:1 or 6:1. The line-shedding cheek block features a small mounting footprint and drainholes. The T2 requires no fasteners, rivets or other metal parts for the lightest soft attach block ever.

Part No. Description Sheave Dia. Length Weight Shackle Dia. Max Line SWL Break Strength
in mm in mm oz g in mm in mm lbs kg lbs kg
H340 Single/Swivel 1-1/8 29 2-5/8 66 0.9 26 5/32 4 5/16 8 330 150 1,000 454
H341 Single/Swivel/Becket 1-1/8 29 3-1/16 78 1.0 28 5/32 4 5/16 8 330 150 1,000 454
H342 Double/Swivel 1-1/8 29 2-7/8 73 1.8 51 3/16 5 5/16 8 660 299 1,625 737
H343 Double/Swivel/Becket 1-1/8 29 3-3/8 85 1.9 54 3/16 5 5/16 8 660 299 1,625 737
H344 Triple/Swivel 1-1/8 29 2-7/8 73 2.6 74 3/16 5 5/16 8 990 449 2,000 907
H345 Triple/Swivel/Becket 1-1/8 29 3-3/8 85 2.7 77 3/16 5 5/16 8 990 449 2,000 907
H346 Triple/423 Carbo-Cam** 1-1/8 29 2-7/8 73 4.6 130 3/16 5 1/4 6 750 340 1500 680
H347 Triple/423 Carbo-Cam/Becket** 1-1/8 29 3-3/8 85 4.7 133 3/16 5 1/4 6 900 408 1,800 816
H348 Single/Fixed* 1-1/8 29 11-5/16 49 0.8 23 - - 5/16 8 330 150 1,000 454
H349 Stand-up/Fixed* 1-1/8 29 2-3/16 56 1.1 31 - - 5/16 8 330 150 1,000 454
H350 Cheek 1-1/8 29 11-1-16 42 0.6 17 - - 5/16 8 330 150 1,000 454
H2146 Single T2 1 1/8 29 1 11/16 43 0.4 12 - - 5/16 8 330 150 1,000 454
H352 90 Degree Fixed Head 1-1/8 29 2-1/16 52 0.9 26 - - 5/16 8 330 150 1,000 454
H353 Traveler 1-1/8 29 3-5/8 92 1.2 34 - - 5/16 8 330 150 1,000 454
H371 Clew Block Assembly 1-1/8 29 4-7/8 124 1.8 51 - - 5/16 8 330 150 1,000 454
H381 Double/Fixed 1-1/8 29 2-1/8 54 1.2 34 - - 5/16 8 660 299 1,625 737

* Can be used as becket block **Safe working loads and breaking strengths for blocks based on cam strengths

H2146 29mm T2 Single Price: $21.74 H340 29mm Carbo Single Price: $21.30
H341 29mm Carbo Single w/Bec Price: $24.55 H342 29mm Carbo Double Price: $38.68
H343 29mm Carbo Double w/Bec Price: $41.93 H344 29mm Carbo Triple Price: $50.78
H345 29mm Carbo Triple w/Bec Price: $54.03 H346 29mm Carbo Triple w/Cam Price: $88.84
H347 29mm Carbo Triple w/Cam&Bec Price: $92.09 H348 29mm Carbo Single Fixed Price: $12.58
H349 29mm Carbo Single w/Spring&Eye Price: $19.62 H350 29mm Carbo Cheek Price: $13.51
H352 29mm Carbo 90 Degree Fix Head Price: $16.98 H353 29mm Carbo Traveler Price: $27.10
H371 29mm Carbo Clew Block Assembly Price: $26.80 H381 29mm Carbo Double Fixed Price: $32.78


Harken 40mm and 50mm Cam Cleat Conversion Kits

Harken 40mm and 50mm Cam Cleat Conversion Kits

Easily add a cleat to an existing block. These handy conversion kits make it so buying a new assembly isn't necessary, saving you money. Includes all parts necessary to add a cam cleat, including the 150 cam cleat.

Part No. Description Weight Converts
oz g Part No. Description Part No. Description
HSB326 40mm Conversion Kit 2.0 54 H2636 Single w/ Swivel H2637 Single w/ Swivel & Becket
HSB327 40mm Conversion Kit 3.0 85 H2640 Triple w/ Swivel H2641 Triple w/ Swivel & Becket
HSB328 57mm Conversion Kit -- -- H2600 Single w/ Swivel H2601 Single w/ Swivel & Becket
HSB329 57mm Conversion Kit -- -- H2604 Triple w/ Swivel H2605 Triple w/ Swivel & Becket


HSB326 40mm Carbo Block Cam Conversion Kit Price: $57.60 HSB327 40mm Carbo Triple Cam Conversion Kit Price: $55.84
HSB328 57mm Carbo Block Cam Conversion Kit Price: $84.98 HSB329 57mm Carbo Triple Cam Conversion Kit Price: $83.39


40mm Carbo AirBlocks

40mm Carbo AirBlocks

Low-friction Carbo AirBlocks® are lightweight, strong, reliable—and affordable.These are features all sailors look for when choosing sail controls and a real breakthrough in block design. Companions to Harken’s® popular Black Magic® line, these small, compact blocks have very high working loads for safe, easy trimming no matter how hard the wind blows.

Sideplates of made of high-strength engineering resin and are UV stabilized to provide excellent protection against long-term exposure to salt water and sun. Carbo blocks are perfect for the small-diameter hard lines favored by racers. Works well for jib and mainsheet systems on high performance dinghies.

Part No. Description Sheave Dia. Length Weight Shackle Dia. Max Line SWL Break Strength
in mm in mm oz g in mm in mm lbs kg lbs kg
H2636 Single/Swivel 1-9/16 40 3-3/8 86 1.6 44 5/32 4 3/8 10 485 220 1620 735
H3637 Single/Swivel/Becket 1-9/16 40 4 102 1.7 48 5/32 4 3/8 10 485 220 1620 735
H2638 Double/Swivel 1-9/16 40 3-11/16 94 3.2 86 3/16 5 3/8 10 970 440 2380 1080
H2639 Double/Swivel/Becket 1-9/16 40 4-5/16 110 3.4 90 3/16 5 3/8 10 970 440 2380 1080
H2640 Triple/Swivel 1-9/16 40 3-11/16 94 4.6 118 3/16 5 3/8 10 1455 660 3050 1383
H2641 Triple/Swivel/Becket 1-9/16 40 4-5/16 110 4.7 122 3/16 5 3/8 10 1455 660 3050 1383
H2642 Double/Fixed 1-9/16 40 3-1/2 89 2.8 80 3/16 5 3/8 10 970 440 2380 1080
H2643 Double/Swivel/Becket 1-9/16 40 4-3/16 106 2.9 84 3/16 5 3/8 10 970 440 2380 1080
H2644 Cheek 1-9/16 40 2-3/4 70 1.2 34 - - 3/8 10 485 22 1620 735
H2645 Single/423 Carbo-Cam** 1-9/16 40 3-3/8 86 4.2 119 5/32 4 1/4 6 150 668 300 136
H2646 Single/423 Carbo-Cam/Becket** 1-9/16 40 4 102 4.3 122 5/32 4 1/4 6 300 136 600 272
H2647 Triple/Swivel/423 Carbo-Cam** 1-9/16 40 3-11/16 94 8.2 232 3/16 5 1/4 6 750 340 1500 680
H2648 Triple/Swivel/423 Carbo-Cam/Becket** 1-9/16 40 4-5/16 110 8.3 235 3/16 5 1/4 6 900 408 1800 816
H2649 Traveler 1-9/16 40 4-1/4 108 1.8 52 - - 5/16 8 330 150 1000 454
H2650 Single/Fixed* 1-9/16 40 2-1/2 64 1.4 40 - - 3/8 10 485 220 1620 735
H2149 Single T2 1 9/16 40 2 1/4 57 0.9 25 - - 3/8 10 485 220 1,200 544
H2148 Single T2 Loop 1 9/16 40 2 1/4 57 0.9 26 - - 3/8 10 485 220 1,200 544
H2652 Stand-up/Fixed* 1-9/16 40 2-3/4 70 1.7 48 - - 3/8 10 485 220 1620 735
H2654 Quad/Swivel 1-9/16 40 3-11/16 94 6 170 3/16 5 3/8 10 1455 660 3050 1383
H2659 90 Degree Head 1-9/16 40 2-15/16 75 1.6 44 - - 3/8 10 485 220 1620 735

* Can be used as becket block **Safe working loads and breaking strengths for blocks based on cam strengths

H2148 40mm T2 Loop Single Price: $38.15 H2149 40mm T2 Single Price: $33.09
H2636 40mm Carbo Single Price: $27.68 H2637 40mm Carbo Single w/Bec Price: $32.21
H2638 40mm Double Swivel Price: $62.70 H2639 40mm Carbo Doubl w/Bec Price: $67.23
H2640 40mm Carbo Triple Price: $103.49 H2641 40mm Carbo Triple w/Bec Price: $108.02
H2642 40mm Carbo Fixed Double Price: $52.27 H2643 40mm Carbo Fixed Doub w/Bec Price: $56.80
H2644 40mm Carbo Cheek Price: $26.62 H2645 40mm Carbo Single w/Cam Price: $90.24
H2646 40mm Carbo Single w/Cam&Bec Price: $94.78 H2647 40mm Carbo Triple w/Cam Price: $159.41
H2648 40mm Carbo Triple w/Cam&Bec Price: $163.94 H2649 40mm/29mm Carbo Traveler Block Set Price: $35.95
H2650 40mm Carbo Single Fixed Price: $22.70 H2652 40mm Carbo Single w/Spring&Eye Price: $30.45
H2654 40mm Carbo Quad Swivel Price: $137.41 H2659 40mm 90 degree head block Price: $30.89


57mm Carbo AirBlocks

57mm Carbo AirBlocks

Carbo AirBlocks® are 60% stronger and 30% lighter than the classic Harken blocks.

The nylon resin sideplates are densely packed with long-glass fibers for a compact block with a high strength-to-weight ratio. Ball bearings, sheave and sideplates UV stabilized with black additive for maximum protection.

Blocks feature Cam-Lock or U-Lock locking systems to lock the shackle in front or side positions, or swivel to keep line from twisting.

The high-load 57 mm Carbo has a broad working range. Use for main and jib sheets on centerboard and keelboats like Lightnings, Dragons, Solings, J/24s and for mainsheet systems on catamarans.

Part No. Description Sheave Dia. Length Weight Shackle Dia. Max Line SWL Break Strength
in mm in mm oz g in mm in mm lbs kg lbs kg
H2600 Single/Swivel 2-1/4 57 4-5/16 110 3.1 87 3/16 5 7/16 10 792 360 2380 1080
H2601 Single/Swivel/Becket 2-1/4 57 5-3/16 132 3.4 96 3/16 5 7/16 10 792 360 2380 1080
H2602 Double/Swivel 2-1/4 57 4-3/4 121 6.3 178 - 6 7/16 10 1584 720 3300 1500
H2603 Double/Swivel/Becket 2-1/4 57 5-5/8 142 6.6 187 - 6 7/16 10 1584 720 3300 1500
H2604 Triple/Swivel 2-1/4 57 4-3/4 121 9 255 - 6 7/16 10 2380 1080 5000 2270
H2605 Triple/Swivel/Becket 2-1/4 57 5-5/8 142 9.3 264 - 6 7/16 10 2380 1080 5000 2270
H2606 Cheek 2-1/4 57 3-5/8 92 2.4 68 - - 7/16 10 792 360 2380 1080
H2152 Single T2 2 1/4 57 3 1/16 79 2 57 - - 7/16 10 792 359 2,380 1,080
H2151 Single T2 Loop 2 1/4 57 3 1/16 79 2 59 - - 7/16 10 792 359 2,380 1,080
H2615 Single/Swivel/150 Cam-Matic** 2-1/4 57 4-5/16 110 9.5 269 3/16 5 7/16 10 300 136 750 340
H2616 Single/Swivel/150 Cam-Matic/Becket** 2-1/4 57 5-3/16 132 15.6 442 3/16 5 7/16 10 600 272 1500 680
H2617 Triple/Swivel/150 Cam-Matic** 2-1/4 57 4-3/4 121 15.2 431 - 6 7/16 10 1500 680 3750 1700
H2618 Triple/Swivel/150 Cam-Matic/Becket** 2-1/4 57 5-5/8 142 15.6 442 - 6 7/16 10 1800 816 4500 2040
H2631 Quadruple/Swivel 2-1/4 57 4-3/4 121 12 340 - 6 7/16 10 2380 1080 5000 2270

* Can be used as becket block **Safe working loads and breaking strengths for blocks based on cam strengths

H2151 57mm T2 Loop Single Price: $45.14 H2152 57mm T2 Single Price: $40.30
H2600 57mm Carbo Single Price: $40.30 H2601 57mm Carbo Single w/Bec Price: $45.06
H2602 57mm Carbo Double Price: $85.71 H2603 57mm Carbo Double w/Bec Price: $90.46
H2604 57mm Carbo Triple Price: $123.07 H2605 57mm Carbo Triple w/Bec Price: $127.82
H2606 57mm Carbo Cheek Price: $37.05 H2615 57mm Carbo Single w/Cam Price: $114.27
H2616 57mm Carbo Single w/Cam&Bec Price: $119.02 H2617 57mm Carbo Triple w/Cam Price: $184.80
H2618 57mm Carbo Triple w/Cam&Bec Price: $189.55 H2631 57mm Carbo Quadruple Price: $154.04


75mm Carbo Air Blocks

75mm Carbo Air Blocks

Carbo AirBlocks® are 60% stronger and 30% lighter than the classic Harken blocks. The nylon resin sideplates are densely packed with long-glass fibers for a compact block with a high strength-to-weight ratio. Ball bearings, sheave and sideplates UV stabilized with black additive for maximum protection.

Blocks feature Cam-Lock or U-Lock locking systems to lock the shackle in front or side positions, or swivel to keep line from twisting. It releases easily under load and is perfect for mainsheet systems on sport boats like the Melges 24, J/105 and Henderson 30

Part No. Description Sheave Dia. Length Weight Shackle Dia. Max Line SWL Break Strength
in mm in mm oz g in mm in mm lbs kg lbs kg
H2660 Single/swivel 2-15/16 75 5-3/8 137 6.9 195 5/16 8 9/16 12 1213 550 3638 1650
H2661 Single/swivel/becket 2-15/16 75 6-1/2 165 7.5 214 5/16 8 9/16 12 1213 550 3638 1650
H2662 Double/swivel 2-15/16 75 6 152 14.2 402 5/16 8 9/16 14 2426 1100 6000 2722
H2663 Double/swivel/becket 2-15/16 75 7 178 14.8 419 5/16 8 9/16 14 2426 1100 6000 2722
H2664 Triple/swivel 2-15/16 75 6 152 20.5 580 5/16 8 9/16 14 3639 1650 10000 4535
H2665 Triple/swivel/becket 2-15/16 75 7 178 21.1 599 5/16 8 9/16 14 3639 1650 10000 4535
H2666 Single/swivel/150 Cam-Matic** 2-15/16 75 5-3/8 137 13.4 381 5/16 6 1/2 14 300 136 750 340
H2667 Single/swivel/150 Cam-Matic/becket** 2-15/16 75 6-1/2 165 14 397 5/16 6 1/2 14 600 272 1500 680
H2668 Triple/swivel/150 Cam-Matic** 2-15/16 75 6 152 27.8 788 5/16 6 1/2 14 1500 680 3750 1700
H2669 Triple/swivel/150 Cam-Matic/becket** 2-15/16 75 7 178 28.4 805 5/16 6 1/2 14 1800 816 4500 2040
H2677 Quadruple/swivel 2-15/16 75 6-1/4 159 27.2 772 5/16 8 9/16 12 3639 1650 10000 4535

**Safe working loads and breaking strengths for blocks based on cam strengths

H2660 75mm Carbo Single Price: $70.93 H2661 75mm Carbo Single w/Becket Price: $81.75
H2662 75 mm Carbo Double Price: $141.77 H2663 75 mm Carbo Double with Becket Price: $152.59
H2664 75 mm Carbo Triple Price: $202.66 H2665 75 mm Carbo Triple w/ Becket Price: $213.49
H2666 75 mm Carbo Single with Cam Price: $180.49 H2667 75 mm Carbo Sgl w/ Cam + Beckt Price: $191.31
H2668 75 mm Carbo Triple with Cam Price: $326.30 H2669 75 mm Carbo Triple w/ Cam +Bkt Price: $337.13
H2677 75mm Carbo Quadruple Price: $224.31


Carbo Fiddles

Carbo Fiddles

The Carbo Fiddle range features high-load ball bearings with fitted races for low-friction operation. The 40mm Fiddles are excellent for 3:1 or 4:1 tackles on dinghy vangs and mainsheets, or for controls such as cunninghams or internal boom outhauls on larger boats.

The 57mm Fiddles feature the Cam-Lock system allowing the post to swivel freely or lock at 90° intervals. Cam arms can adjust to five different positions. Composite plates lock arms to the block with 35 pins.

The 57mm and 75mm switchable ratchets provide easy on/off control with accessible, easy to operate switches on both sides of the block.

40mm Fiddle Blocks
Part No. Description Sheave Dia. Length Weight Shackle Dia. Max Line SWL Break Strength
in mm in mm oz g in mm in mm lbs kg lbs kg
H2655 Fiddle 1-9/16 40 4-1/2 115 1.8 51 5/32 4 3/8 10 485 220 1620 735
H2656 Fiddle/becket 1-9/16 40 5-1/8 131 1.9 54 5/32 4 3/8 10 485 220 1620 735
H2657 Fiddle/423 Carbo-cam 1-9/16 40 4-1/2 115 4.4 125 5/32 4 1/4 6 485 220 1620 735
H2658 Fiddle/423 Carbo-cam/becket 1-9/16 40 5-1/8 131 4.5 128 5/32 4 1/4 6 485 220 1620 735


57 mm Fiddle Blocks
Part No. Description Sheave Dia. Length Weight Shackle Dia. Max Line SWL Break Strength
in mm in mm oz g in mm in mm lbs kg lbs kg
H2621 Fiddle 2-1/4 57 6 153 3.7 105 3/16 5 7/16 10 792 359 2,380 1,079
H2622 Fiddle/Becket 2-1/4 57 6-7/8 175 4.0 113 3/16 5 7/16 10 792 359 2,380 1,079
H2623 Fiddle/150 Cam-Matic 2-1/4 57 6 153 10.1 286 3/16 5 7/16 10 792 359 2,380 1,079
H2624 Fiddle/150 Cam-Matic/Becket 2-1/4 57 6-7/8 175 10.4 295 3/16 5 7/16 10 792 359 2,380 1,079
H2673 Fiddle Ratchet 2-1/4 57 4-5/8 117 4.0 133 3/16 5 3/8 9 793 360 2,380 1,079
H2676 Fiddle/Ratchet/150 Cam-Matic/Becket 2-1/4 57 5-5/8 143 10.7 303 3/16 5 3/8 9 793 360 2,380 1,080


75 mm Fiddle Blocks
Part No. Description Sheave Dia. Length Weight Shackle Dia. Max Line SWL Break Strength
in mm in mm oz g in mm in mm lbs kg lbs kg
H2690 Fiddle 2-15/16 75 6-3/16 157 8.4 238 9/16 14 7/16 10 1,212 550 3,637 1,650
H2691 Fiddle/Becket 2-15/16 75 7-7/16 189 9.1 257 9/16 14 7/16 10 1,212 550 3,637 1,650
H2692 Fiddle/150 Cam-Matic 2-15/16 75 6-3/16 157 15.0 424 1/2 12 7/16 10 1,212 550 3,637 1,650
H2693 Fiddle/150 Cam-Matic/Becket 2-15/16 75 7-7/16 189 15.6 443 1/2 12 7/16 10 1,212 550 3,637 1,650
H2694 Fiddle Ratchet 2-15/16 75 6-3/16 157 9.5 270 1/2 12 3/8 9 1,212 550 3,637 1,650
H2695 Fiddle/Ratchet//Becket 2-15/16 75 7-7/16 189 10.2 289 1/2 12 3/8 9 1,212 550 3,637 1,650
H2696 Fiddle/Ratchet/150 Cam-Matic 2-15/16 75 6-3/16 157 16.1 456 1/2 12 3/8 9 1,212 550 3,637 1,650
H2697 Fiddle/Ratchet/150 Cam-Matic/Becket 2-15/16 75 7-7/16 189 16.8 475 1/2 12 3/8 9 1,212 550 3,637 1,650


H2621 57mm Carbo Fiddle Price: $48.40 H2622 57mm Carbo Fiddle w/Bec Price: $53.15
H2623 57mm Carbo Fiddle w/Cam Price: $124.65 H2624 57mm Carbo Fiddle w/Cam&Bec Price: $129.40
H2655 40mm Carbo Fiddle Price: $37.88 H2656 40mm Carbo Fiddle w/Bec Price: $42.42
H2657 40mm Carbo Fiddle w/Cam Price: $100.41 H2658 40mm Carbo Fiddle w/Cam&Bec Price: $104.94
H2673 57mm Carbo Ratchet Fiddle Price: $80.34 H2676 57mm Carbo Ratchet Fiddle w/ Bec & Cam Price: $159.37
H2690 75mm Carbo Fiddle Price: $84.30 H2691 75mm Carbo Fiddle w/ Bec Price: $93.46
H2692 75mm Carbo Fiddle w/ Cam Price: $157.30 H2693 75mm Carbo Fiddle w/ Cam & Bec Price: $166.98
H2694 75mm Carbo Ratchet Fiddle Price: $115.32 H2695 75mm Carbo Ratchet Fiddle w/ Bec Price: $125.31
H2696 75mm Carbo Ratchet Fiddle w/ Cam Price: $191.58 H2697 75mm Carbo Ratchet Fiddle w/ Bec & Cam Price: $202.40


57mm & 75mm Flip-Flip Blocks

57mm & 75mm Flip-Flip Blocks

Small Boat Flip-Flop blocks pivot around the line axis to keep line close to the deck. Hinged construction allows for various lead applications.

Lightweight, machined 6061-T6 aluminum cheeks pivot on fiber-reinforced plastic chocks. Free rolling ball bearings, sheave and sideplates are UV stabilized with black additives for maximum protection.

Ratchamatic® versions roll freely in both directions under low loads and automatically engage a ratchet mechanism as loads increase, giving sailors a holding power of up to 15:1. The ratchet engagement can be adjusted to a higher or lower load depending on the sailor’s strength, sailing style and system usage.

Reversible cam arms adjust and lock in a wide range of positions for crew accessibility and accommodation of changing lead angles.

Part # Description Sheave Dia. Width Length Height Max Line Weight SWL Break Strength
in mm in mm in mm in mm in mm oz g lb kg lb kg
H2144 57mm Ratchamatic 2-1/4 57 2 50 4-5/16 110 2-5/8 67 3/8 10 5.5 156 500 227 1,000 554
H2145 57mm Ratchamatic w/ Cam* 2-1/4 57 2-5/8 67 4-5/16 110 4-3/16 106 3/8 10 12 329 300 136 600 272
H2678 75mm 3 75 2-1/2 64 5-5/8 143 3-3/4 95 9/16 14 9.7 275 1,213 550 2,426 1,100
H2679 75mm w/ Cam* 3 75 2-5/8 67 5-5/8 143 5-9/16 141 9/16 14 17 485 300 136 600 272
H2688 75mm Ratchamatic 3 75 2-1/2 64 5-5/8 143 3-1/2 89 7/16 12 11 304 750 340 1,500 680
H2689 75mm Ratchamatic w/ Cam* 3 75 2-5/8 67 5-5/8 143 5-3/8 137 7/16 12 18 514 300 136 600 272
* - Safe working loads and breaking strengths for blocks are based on cam strengths.


H2144 57mm SB Ratchamatic Flip Flop Block Price: $187.09 H2145 57mm Ratchamatic Flip-Flop Block w/Cam Price: $260.70
H2678 75mm SB Flip Flop Block Price: $189.29 H2679 75mm SB Flip Flop Block w/Cam Price: $289.12
H2688 75mm SB Ratchamatic Flip Flop Block Price: $234.65 H2689 75mm SB Ratchamatic Flip Flop Block w/Cam Price: $334.40


Standup Springs and Boots

Standup Springs and Boots

Prevent your blocks from laying down on the job. These boots and springs keep blocks upright which improves the lead angle. Use the boots where snagging could be a problem or in combination with a spring for heavy blocks. Spring Cup (HSB2) keeps blocks seated in the upright position for better lead angles and can be used with any swivel post block at H071 spring.
The tapered springs should be used only for loop top blocks, the non-tapered can be used for loop top or swivel post blocks.

H071 Stand Up-Spring Price: $1.01 H097 Small Stand-Up Spring, Small Price: $0.77
H1603 MR Stand-Up Spring Price: $2.90 H369 Stand-Up Boot, Medium, Black PVC Price: $10.34
H370 Stand-Up Boot, Large, Black PVC Price: $12.41 HSB2 Spring Cup for H071 Spring Price: $1.00
R1814 Stand-Up Boot, Small, Gray PVC Price: $12.13 R1815 Stand-Up Boot, Large, Gray PVC Price: $15.44
RF318 Tapered Stand-Up Spring, Small Price: $2.08 RF321 Tapered Stand-Up Spring, Medium Price: $3.78

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