Aluminum alloy, fed qq-a-591, composition 1 or 2, white enamel finish, 0.110 in. Thk material, 5-3/8 in. O/a w, 6-3/4 in. O/a lg, four 9/32 in. Diameter mtg holes spaced 3 in. C to c on w by 6-1/8 in. C to c on lg, 5 in. O/a h four switch mtg holes, two 1-21/32 in. Dia, one ea 11/16 and 29/32 in. Dia