Slide-Co 16261 Bi-Fold Door Bottom Pivot, Steel Bi-Fold Door Bottom Pivot Bottom Mount With Hexhead Bolt For Quick Vertical Adjustment 7/16" OD and Fits 1" To 1-3/8" Doors Bottom mount Fits 1in. to 1-3/8in. bi-fold doors up to 50 lbs. each Hex bolt for quick vertical adjusting Fits Acme, Cox and Johnson bi-fold doors