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 pair. The coating helps with corrosion if your garage gets damp or you're in a humid climate. These bolt to the bottom of the door panel and hold the lift cables. If your current brackets are rusty, bent, or the pin holes are worn, the cables can't seat right and you'll get uneven lifting. Two brackets in the set, one for each side. Make sure the Milford pin style matches your existing cable loop hardware.