Designed especially for use in the installation of signal system and alarm wiring. Base has 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.