Prevent unnecessary strain on your windlass by securing the chain to a chain stopper Handles chain from 5/16" to 3/8" Pawl flips up when not in use Constructed from solid stainless steel Base Measures 3 1/8" x 2 11/16" Description Prevent unnecessary strain on your windlass by securing the chain to a chain stopper. This chain stopper grips chain in sizes from 5/16" to 3/8". The pawl flips up when not in use and can be removed. It can be mounted alone on the deck or inside a bow roller (if it fits). Constructed from solid stainless steel.