DIYHD Ceiling Mount Bypass Box Track Sliding Barn Door Hardware. Hardware Only, Not Including Door Panel. The kit can be used for interior door and outside door. Full set kit including. Box track2+Bypass bracket2+End cap2. Installed under ceiling directly. Suitable for door thickness:1 3/8″1 3/4″. Please adjust roller screw’s location to make a bigger gap between 2 doors for thick door. 2 rollers can hold 1 door MAX weight 330lbs. Mainly designed for exterior door. Box track hardware is a little bit. Than interior barn door hardware.