Panel and Enclosure Grommets: Type - Grommet, Standard; Mtg Hole Dia.- in - 0.875 in; Mtg Hole Dia.- mm - 22.2 mm; Grommet Inside Dia.- in - 0.625"; Grommet Inside Dia.- mm - 15.9 mm; Max. Panel Thickness - 0.062" (1.6 mm); Height - overall thickness - 0.312" (7.9 mm); Head Diameter - 1.125" (28.6 mm); Installation - Push-In One-Piece; Material - Rubber; Material Specification - BUNA N