Designed for use on both dinghies and keelboats, the Allen Compact Mainsheet Jammer Arm with Swivel Cleat And Block is the perfect solution for those looking for a central jammer that takes up less space and has a lower cleat. This compact mainsheet jammer features a cold forged bearing system with a ball-locating groove for smooth rotation and a 180, 220, or 360 degree rotation angle. Plus, with its carefully optimized angle, cleating and uncleating is a breeze. Choose between a 60m Pro-Ratchet Block or a standard configuration. Additional features include an aluminum cam cleat and a mega pro-lead for added convenience.