This Bi-Fold Door top or bottom pivot bracket by Prime-Line Products is constructed from stamped steel and it comes in a corrosion-resistant, zinc-plated finish. The bracket easily mounts into the top or bottom bi-fold door track, and it used by many manufacturers. These pivot brackets are easy to install with a few simple tools. It fits into a top or bottom track and helps to reduce binding at the pivot. Used on metal bi-folding doors.