The latest in fender adjusters. Made of marine grade reinforced nylon. Clamps securely onto both 7/8" and 1" tubing as well as 3/16" and 1/4" lifeline wire. Unique double locking action locks clamp onto rail or wire and still allows full adjustment of the height of the fender. When the proper height is reached, the final locking action clamps the rope quickly and securely. For use with 1/4" or 5/16" fender lines.