This bi-fold door pivot bracket is constructed from stamped steel that is zinc plated and features a self lubricating nylon bushing. It has an adjustable design that easily mounts to your floor or door jamb. Typically these pivot brackets are used for Acme doors that are 1 inch to 1-3/8 inch thick. Best if used with the Prime-Line part N 6674 pivot bracket. Each package includes 2 bottom pivots, 1 for each bi-fold door bottom.