You install a switch or outlet and the old work box sits too deep in the wall — the cover plate gaps, tilts, and looks unfinished no matter how many times you snug it up. This 4-inch square steel cover plate with a single toggle opening fills that gap and gives you a clean, flush surface that passes inspection. 4-inch square steel, single toggle opening. Steel construction resists cracking under repeated cover plate swaps better than plastic. Zinc plating handles the indoor-outdoor exposure range without surface rust. The flat-back design sits flush against the wall substrate with no rocking. Standard on rough-in and finish-out rounds for residential and light commercial electricians across northeast Nebraska and northwest Iowa — the cover plate that finishes the job when the box is not co Stocked at Crofton Lumber and Akron Lumber.