Top Secret PDR 1 1/2" Domed type Head Hole Plugs (10) in a pack these attractive hole plugs snap into Sheet metal or similar material up to .125" or 3.18mm dome plugs are finishing plugs for unneeded or unused holes in chassis or other surfaces. Convex design tapers to a thin edge for a seamless finish Matte finish head offers a professional and finished appearance Easy installation Plugs lock firmly into surfaces Material: Nylon 6 Color: Black Sizes in Diagram are as follows C .45" D 1.67"