Product Description One-piece all-steel construction. 1/3" fins set at 20 degree angle. 7/8" margin turnback. Painted grilles have a durable powder-coat finish. From the Manufacturer Imperial Manufacturing is a family-owned company that was founded in 1979. Viewed as a world class manufacturer of more than 7,000 heating, air conditioning, ventilation and building products for residential and light commercial applications, with manufacturing and warehouse space across North America. Imperial Manufacturing is acknowledged as an innovator in the design and production of indoor air quality equipment for the North American heating, ventilation and air conditioning industry. These baseboard grills are made of white powder coated steel. They will sit 7/8" out from the wall. The size is based on the size of the hole. If you measure your hole and it is 16 x 8 then you would order a 16 x 8 grill. The faceplate would be 1 1/4 inches large then listed size. So a 16 x 8 would actually have a faceplate of 17 1/4" x 9 1/4".