Excellent Quality:High quality heavy construction, high quality alloy steel floor rails to ensure strength and durability; High-quality drum made of POM material, muffler design, sliding noise reduction. Adjustable:Adjustable at will, the distance between the two rollers meets your needs. After adjusting the screw, it can work smoothly and quietly. Flat Base Surface Design:Upgrade it to a new smooth surface, the Flat Base design allows users to doors don't need slots and won't damage your beautiful floor. It is durable and operates smoothly for maximum efficiency and quietness. Easy to Use:Mounted to the wall with screws, the door does not need grooves. Adjust the position of the roller on the track to suit the door panel. There is no need to drill holes in the floor, it looks beautiful inside and out.