Same RBB-75 bottom brackets as the plain steel version, but with a black powder coat finish. 13-gauge steel, Milford pin, Sold as a matched pair. The coating helps with corrosion When your garage gets damp or you are in a humid climate. These bolt to the bottom of the door panel and hold the lift cables. When your current brackets are rusty, bent, or the pin holes are worn, the cables cannot seat right and You will get uneven lifting. Two brackets in the set, one for each side. Make sure the Milford pin style matches your existing cable loop hardware.