Ronstan's Series 50mm All Purpose (AP) blocks are a great all around solution.
Their self-lubricating, Acetal polymer sheaves run on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing. Its head can be locked at 0ﾰ or 90ﾰ by engaging the grub screw in either the 0 or 90 degree position.
It's not a bad idea to purchase a RF151, which is a standard Dee shackle with slotted pin with a in diameter.
|Breaking Load (lbs)||3310|
|Breaking Load (kg)||1500|
|Clevis Pin (in)||3/16|
|Safe Working Load (lbs)||1650|
|Safe Working Load (kg)||750|
|Sheave Diameter (in)||2 1/8 + 1 5/16|
|Sheave Diameter (mm)||54 + 34|