AMRW-AL-1 * Windline Anchor Lock Stainless Steel channel lock sercures your anchor and prevents accidental drop at sea. Allows quick release of anchors on bow rollers of 20'-50' boats. 5/16" faspin locks shackle or chain in place for chain up to 7/16" and anchors up to 70lbs. Overall Lenght 4" Overall Width 1.5"