1-1/2" 1.5 inch Flush Mount Black Rubber Body and Sheet Metal Hole Plug For Panel thickness 0.03" to 0.08 ". Fits 1-1/2" ID diameter holes. made of thermoplastic rubber for holes ranging in size from 1.516" – 1.575" with A thickness of the material being installed in of 0.031"- 0.079"