Panel and Enclosure Hole Plugs: Type - Hole Plug; Mtg Hole Dia.- in - 1.125 in; Mtg Hole Dia.- mm - 28.6 mm; Max. Panel Thickness - 0.125" (3.2 mm); Plug Height - Length - 0.343" (8.7 mm); Plug Head Dia. - 1.312" (33.3 mm); Installation - Push-In; Material - Steel