Harken 57mm Carbo Double Ratchamatic Block57 mm Double Ratchamatic Block Swivel The Carbo Ratchamatic is a load sensing ratchet block that rolls freely in both directions under low loads and automatically engages the ratchet as loads increase. Shifting between ratchet and light air modes is seamless. Use the 2634 with a 402 or 403 swivel arm for a versatile two speed mainsheet system.
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