1/2, 3/4, 1 in Knockout Blank Plug Set
A set of three snap-in blanking plugs for unused electrical knockouts: 1/2 in trade (22.2 mm hole), 3/4 in trade (27.8 mm) and 1 in trade (34.5 mm). They print on one snap-off sprue about 121 mm long. Slotted spring fingers with a 45° barb push in from the front, grip steel box and panel walls about 1–2 mm thick, and leave a flush flange 4 mm wider than the hole on every side.
garage electrical knockout-plug junction-box