Cover accepts fan bracket device with mounting centers of 3 3/16 (81mm). Base has six mounting holes and 4 1/2 trade size KOs. #10 mounting studs provided. Rated for fans and fixtures up to 50 lbs. 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. Ivory