1/2" or .500" WHITE PLUG (25) Top Secret PDR Flush Type head Plugs White designed to snap into holes in sheet metal, These plugs add a nice finish to your project. button plugs with flush-type heads can be used for plugging holes in equipment made of sheet metal, such as automobile bodies, tanks, refrigeration units, etc. Can be snapped into holes easily Held in place by a bead until deliberately removed Material: Low-density polyethylene. These plugs 1/2" Plug Specifications are as follows for Diagram in Photos. A .25" B .86" C .54"