Best used to make custom made tow ropes for sea kayaking, paddling with kids, quick tow for surfing and white water. A Sea-Lect, aka Sea Dog product. Made of Injection Molded Nylon. Hook is 3.75 inches long. Best used with line that is no longer in diameter than 7/16 inch. Plastic hook is lighter in the water than metal. Eye traps hook. Clips on and off easy. (Sea-Lect part number K157110.) SEA-TOW