Portable Winch Double Swing Side Self-Locking Pulley - 9000-lb. Break Strength, Model# PCA-1272 Spring-loaded cam release-cord disengaged Two pulleys used together give you a 4:1 mechanical advantage Mounted on self-lubricating bushings and stainless steel axles &#160;Aluminum swing sides and main plate For 1/2in. and 3/8in. ropes