Specification: Item: 4FT Stainless Double Door Hardware KitMaterial: Stainless SteelFit Wood Door Thickness: From 1.37" to 1.57"Maximum Door weight: 220lb for each door 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. 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.