Premium Material: The barn door floor guide is made of sturdy carbon steel with black powder coating to ensure its stability and wear resistance. The surface of the nylon rollers are made of POM material to prevent scratches. It designed for long-term use Unique Design: The bottom of barn door guides is flush with the floor design, and the wall-mounted design can adjust the installation height according to the position of the barn door Multiple Combinations: 8 combinations are suitable for barn doors of various thicknesses (maximum 3.5inch) Easy to Install: Wall-mounted barn door floor rails with mounting screw hardware for easy and quick installation and adjustment Wide Applications: The adjustable stay rollers are suitable for most barn doors. It can be used in barn doors, wardrobe, TV cabinet, living room, bedroom, kitchen, warehouse, restaurants, garages, etc HOME MASTER HARDWARE Barn Door Floor Guide Black, Sliding Door Guides Floor Mount, Adjustable Barn Door Rollers for Bottom, 8 in 1 Floor Track, Flush Bottom Design, 2 Pack