Slide-Co 16470 Bi-Fold Door Adjustable Bottom Pivot Bi-fold door bottom pivot Bottom mounted with Hex head bolt for quick vertical adjustment Make to fit screen kit Bottom pivot has 3/8in. O.D. steel base Fits 1in. to 1-3/8in. thick bi-fold doors up to 30lbs 3/8in. Diameter Shaft Zinc Plated Finish