High Quality Material: Made of high quality hard plastic, long service life. It has good impact resistance and does not rust. This is a fully adjustable floor track available for all door thickness. Easy to install: Freely adjust the distance according to the thickness of the door and tighten the screws to fix it. It can be done easily without tools. ApplicabilityThe adjustable sliding door rollers are suitable for door panels from 30mm to 60mm, and the adjustable design makes you comfortable and fast. Easy to slide: Smooth bearings can slide easily, then the door slides easily. The floor rails have a flat bottom without damaging the door, and the floor can slide smoothly and quietly Simple and beautiful style: no need to drill holes in the wall, no damage. The floor rails are floor mounted in a refined, lightweight form. The design is very simple and beautiful.