4 Square, 1/2 in. Raised 30. 4 in square, 1/2 in raised, 30-50 amp receptacle, 2.141 in industrial surface covers are used to attach a 30-50 Amp receptacle, 2.141 in device directly onto 4 in square boxes in a industrial setting. Garvin Industries' 4 in square industrial surface cove www.garvinindustries.com
