Panel and Enclosure Grommets: Type - Grommet, Standard; Mtg Hole Dia.- in - 0.437 in; Mtg Hole Dia.- mm - 11.1 mm; Grommet Inside Dia.- in - 0.312"; Grommet Inside Dia.- mm - 7.9 mm; Max. Panel Thickness - 0.062" (1.6 mm); Height - overall thickness - 0.281" (7.1 mm); Head Diameter - 0.625" (15.8 mm); Installation - Push-In One-Piece; Material - Rubber; Material Specification - BUNA N