For deep switches and receptacles. Base has two 1/2" trade size KOs. Larger gang boxes available by special order. Three-gang: 4 5/8" L x 6 1/2" W (117mm x 165mm). 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.