Door Weight Capacity 330lbs: Aeronautical grade aluminum track, load bearing is 2 times stronger than steel track. Spray painting black surface, anti-corrosion. Solid, straight and lighter. Fit Mostly Size Door: Adjustable roller bolts make our hardware fits 1 3/8"- 1 15/16" thick door. Lower Noise and Safe: Door stops with embedded spring, reduce the vibration for a quiet close, stop your door exactly where you want.Anti-jumpers won't allow door to be lifted off track. Floor guide prevents door from swinging out. Easy to Assemble and Complete Hardware: Our easy step-by-step installation manul to simplify the installation process. Includes 4xRollers; Spliced 10.5ft Track (pre-drilled); 4XStoppers; 4XAnti-jump Disk; 2XFloor guide; 1XInstallation manual, and all other accessories. NO DOOR INCLUDED. Manufacturer's direct marketing; Through Strict QC, Meticulously packaged to avoid scratches in shipment; Professional Customer service team help you solve all installation problems in time. Specification: Item: 10.5FT Double Door Hardware KitMaterial: Metal&SteelFit Door Panel Thickness: About 1 3/8"- 1 15/16"Maximum Door weight: 330lb for each doorThe top of the Doors to the ceiling : Min distance is 6.7" Exclusive Upgrade Design: Door Stops with Spring: can reduce vibration and noise during opening and closing the door,and extend the life of the kit.Oval Rail Connector: easy to install ,the wheels can pass the rail smoothly.Adjustable Screw: The roller screws can be adjusted freely in any size within the door thickness from 1 3/8"- 1 15/16". Wide Applicability: Suitable for indoor decoration in kitchen, bedroom, dressing room, laundry room,Utility room,Entertainment console,club, pub and so on. Q&A: 1.Can the rail be cut down in size ?Yes, it can. But we have many sizes can be spliced. For convenience if you need the size specially,please contact with us.2.How to Choose Rail Size?Double Door Rail Length= 4 x Single Door Panel Width.(If your door width is 2FT, You will need 8FT Kit for double door)3.What if my studs don't line up with the pre-drilled holes in the rail? Attach a header board into your studs first, and then the rail can attach anywhere into the header board.