75mm Carbo Ratchamatic Block - 2X Grip - #2177Power3 ratchet blocks provide sailors that race small one designs with three holding power options to handle a variety of wind and sea conditions. More choices allow sailors to fine tune their set ups in tandem with the purchase that provides the ideal level of power, responsiveness and grip. 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