21-inch ORB, zinc coated, 12 gauge steel. Same deal as the other operator reinforcement brackets but sized at 21 inches for wider doors or specific opener arm setups. The zinc helps it hold up against moisture so it won't rust out as fast. Clevis pin and cotter ring are included. If the bracket on your door is cracked, bent, or the pin holes are wallowed out, just match the length to what you've got now. The 21-inch size isn't universal so double-check before ordering.