PARTSMART SMR430010 Dock Bumper, 6" x 3" x 3.25" Nyracord&#174; Rubber heavy duty dock and body bumpers offer extended service life over standard rubber offerings. Nyracord&#174; Rubber is a premium rubber material combined with sturdy fiber for consistent durability and use on the open road. Ideal for: 1) Truck and trailer bodies 2) Loading docks and bays 3) Heavy equipment and material handling areas Recessed 1/2" diameter bolt holes help to protect vehicles and structures from damage on impact. Rounded corners improve durability by reducing the chance of tearing or breaking.