Extruded Half-Oval Fender Bumpers Material:Synthetic Rubber provide durable,economical protection for loading dock Extruded Half-Oval Fender Bumpers Description: Material:Synthetic Rubber Introduction:the bolt hole dia.is 1/2",the detailed models in the following: WTD-EHFB003:12"Lx4-1/2"Wx4"H,weight:5lbs WTD-EHFB004:24"Lx4-1/2"Wx4"H,weight:9lbs WTD-EHFB005:36"Lx4-1/2"Wx4"H,weight:14lbs