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The Harken 57 mm Carbo Ratchamatic Power3 Swivel Block with 2X Grip is a lightweight, yet strong block, due to composite fiber-reinforced sideplates, hardcoat-anodized aluminum sheave, and a minimum of moving parts in the ratchet mechanism.
Power3 ratchet blocks handle a variety of wind and sea conditions, allowing hand holding of loaded main, jib, and spinnaker sheets with a fraction of the effort of a regular block. A faceted sheave grips loaded sheets, yet allows instant easing with control for ideal power, responsiveness, and grip. Pressure on the line engages the ratchet mechanism, which switches seamlessly from free-running to ratchet mode. Unloaded main and jib sheets run out freely during mark roundings, and asymmetrical spinnaker sheets release instantly during jibes.
Great for main, jib, and spinnaker sheets on dinghies and sportboats; and control lines on boats of all sizes.
Key Features:
- Glass-filled nylon sideplates and load-carrying bearing races
- Machined, hardkote-anodized aluminum sheaves for strength and corrosion resistance
- Free-running ball bearings for fast trim
- Multi-faceted Power3 sheave grips line securely and ratchet provides mechanical advantage
- Load-sensing ratchet rolls freely on low loads, engages automatically as load increases
- Ratchet action is adjustable to match sailor's strength and sailing style
- Silver Sheave holds 90 kg (200 lb) load with 4.5 kg (10 lb) of effort with a 180° wrap
- Cam arm locking plates accept more than five positions for fair leads
