This 18-inch operator reinforcement bracket is made from 12 gauge steel with a zinc coating. ORBs mount at the top of the door where the opener arm connects, and they keep that connection from flexing or cracking the panel over time. If yours is bent or the holes have wallowed out from years of use, you'll want to swap it. Comes with a clevis pin and cotter ring. Measure your current ORB's length before ordering to make sure 18 inches is the right size for your door and opener setup.