Excellent qualityhigh quality heavy construction, high quality alloy steel floor rails to ensure strength and durability; High quality drum made of POM material, muffler design, reduced sliding noise. AdjustableAdjustable at will, the distance between the two rollers meets your needs. After adjusting the screw, it can operate smoothly and quietly. Flat base surface designUpgrade it to a new smooth surface, Flat Base design allows doors to not needing slots and not damaging your beautiful floor. It is durable and operates smoothly for maximum efficiency and quietness. Easy to use: fixed to the wall with screws, the door does not need grooves. Adjust the position of the roller on the track to fit the door panel. There is no need to drill holes in the floor, it looks beautiful indoors and outdoors.