Re-designed to be sturdier than other round electric cable hatches. Wider outside collar covers up any pre-existing screw holes. The hinge is extra heavy duty. Will not fade or discolor due to weather or chemical action. Vermin door will accept a 30A or 50A cord. Replaces any round hatch up to 4-1/2".Â Cut Out: 3-1/2" dia. Outside: 5-1/8" dia.