Self-Locking Marine Cleat Revolutionary Patented Design. Works with any rope up to 1/2″. Made of durable corrosion resistant aircraft aluminum with a durable clear coat finishIdeal for securing deck & dock lines, fenders, anchor & mooring lines and deck accessoriesJust pull the rope to lockSpring loaded cam lock, self-locking design can use with one hand. Just one quick tug and load is secureReduces risk of horizontal releaseHigher load = Tighter gripStainless mounting hardware