Introduction:The barn door track hardware set is made of high-quality carbon steel, with strong strength and hardness, sufficient to support up to 220 pounds of door panel and confirm the track does not deform. We promise a 5-year free quality assurance to ensure its excellent quality.Q: How to ensure the stability and safety of the door?2 * Door Stoppers: Two door stoppers slide along the rail and tighten down at any point to stop your door exactly where you want, and they're cushioned by rubber caps for a quiet close.1 * Floor Guide: A T-shaped floor guide is supplied (with anchors) to prevent the door from swinging out or up against the baseboard.2 * Anti-jumpers: Those little round discs- go on top of the door and won't allow door to be lifted off rail unless they're turned.Q: How much space do I need above the doorway?A: You will need a minimum of 5' from the top of your door to the ceiling (or crown molding, if any) for this kit to fit correctly.Q: How thick of a door will this kit work with?A: There are solutions for any thickness of door! The bolts included for attaching the hangers to the door support a thickness range of 1 3/8' to 1 3/4', but this can be easily navigated by countersinking the bolt head into the back side of the door, or by picking up 4 longer bolts from your local hardware store. The other thing affected by a thicker door is the spacing needed between the door and wall (or baseboard/doorway trim). Plug in your door depth and trim depth below: