This is a 1/4 inch steel pivot pin in a steel nail down base. The base is 3/8 inch with 2 nail down tabs on either side. It mounts on the bottom back edge of a bi-fold door.
This bi-fold door pivot is constructed from steel. It features a bottom mount design with a hex head bolt for quick vertical adjustment. This pivot fits on 1in. to 1-3/8in. bi-fold doors up to 30lbs. each.