For standard shallow switches and receptacles including single-gang combination devices. Base has two 1/2 trade size KOs. Larger gang boxes available by special order. Two-gang: 4 3/4 L x 4 3/4 W (121mm x 121mm). Accepts NEMA double-gang standard faceplates. NOTE: Certified to Canadian Safety Standards for sale in Canada. When ordering these products, change the V color prefix to vc or the WH color suffix to WHC to denote the Canadian versions. White