Save your space, decorate your room, high-quality carbon steel，frosted black. Sturdy and heavy-duty. Features The distance from the top of the door to the ceiling should be at least 8 inches. Fit for door panel thickness: 1-1/2" to 1-3/4". If your door thickness is not within this range, please contact us, and we will provide suitable bolts. Door Weight Limited: 230lbs each door if you hang 2 doors All tracks are pre-drilled holes, the spacing between each hole is American standard 16''. Tracks 7.5ft and under are one complete track, 8ft and above are connected by multiple shorter tracks, and there are connection holes to expand the track at the end of both sides, therefore, the spacing between the holes in the connecting section may not be 16'' If the studs don't line up with the pre-drilled holes in the rail. If there is a doorway trim. And "door depth'' plus ''trim depth'' is greater than 2'', you need to put a headboard. All tracks are pre-drilled holes, the spacing between each hole is American standard 16''. Tracks 7.5ft and under are one complete track, 8ft and above are connected by multiple shorter tracks, and there are connection holes to expand the track at the end of both sides, therefore, the spacing between the holes in the connecting section may not be 16'' Thickness: between 1 3/8" and 1 3/4" Product Details Product Type: Double Door Barn Door Hardware Kit Track type: Double Bypass Installation Required Tools Needed for Installation: Tape measure, pencil, drill/driver, level ruler, wrench