Cover has twistouts for 2000, 500 and 700 Series Raceways. Base has 1/2 trade size KO and rectangular KO for extension to wall box. Base has #10 threaded hole for ground connection. NOTE: Certified to Canadian Safety Standards for sale in Canada. When ordering these products, change the V color prefix to CV or the G color prefix to CG to denote the Canadian versions. Stainless Steel