Nylon/Aluminum Boat Hook Cap by Sea Dog®. Sea-Dog boat hooks are constructed of marine grade aluminum tubing with a threaded end attachment and comfort grip handle. Add in a four-point hook attachment from a over-molded soft rubber coated hook, that protects your boat from scuffs and scratches, and you have all the makings for a high quality and durable accessory. Its buoyant design keeps the boat hook afloat for more than 5 minutes. The bright orange rubber tip cover is highly visible and removes for accessory attachment. Fits all Sea-Dog boat hook accessories as well as any competitor's accessories featuring universal/Acme threads. Replacement hooks only – 491051-1 small hook is used on the 491021-1, 491024-1, 491034-1, and 491036-1. The 491052-1 large hook is used on the 491012-1 and 491013-1.