Be sure to measure carefully for a correct fit. Diameter of hole 1/4" and thickness of panel 1/16" If measurements are not correct this bumper will not fit. Bumper Diameter 1/2" --- Height of Bumper 1/4" --- Stem Fits Hole Diameter 1/4" --- Ridge Diameter 5/16" --- Optimum panel thickness 1/16" ---- Hard abrasion resistant SBR Rubber --- Durometer Hardness is 55A to 65A --- Temperature range of –25° to +180° F.