Panel and Enclosure Grommets: Type - Grommet, Standard; Mtg Hole Dia.- in - 0.750 in; Mtg Hole Dia.- mm - 19.1 mm; Grommet Inside Dia.- in - 0.500"; Grommet Inside Dia.- mm - 12.7 mm; Max. Panel Thickness - 0.093" (2.3 mm); Height - overall thickness - 0.281" (7.1 mm); Head Diameter - 0.968" (24.6 mm); Installation - Push-In One-Piece; Material - Rubber; Material Specification - BUNA N