This Black Rubber Keel Bumper is used on your trailer to prevent damage to your Boat's Keel. If there is a location on your trailer that has the possibility of coming into contact with and damaging your boat, adding a small hard rubber bumper like this one could save you money by preventing expensive damage to your boats finish. This Keel Protector measures 2 3/4" long and installs to your trailer through the 2 mounting holes on the flat side of the pad (hardware is not included). The Rubber Boat Guard is made of a tough, hard black rubber that won't mark your boat when the two come into contact with each other. Features: - 2 3/4" Long - 2 Mounting Holes- Durable Black Rubber Construction