Reliable Materials: The black coating door bottom roller track is sturdy, rust-proof, and flush with the ground, featuring perfectly rounded corners, strawberry-shaped holes, and built-in screws for more convenience and reliability, meaning these wall rails protect children and toes from injury. Easy to Install: The sturdy sliding barn door roller guides can be fixed/mounted on the wall with screws, low-profile sliding door rollers; interior or exterior, more suitable for fixing doors/gates on the wall, comes with step-by-step instructions, simple and easy to use, giving you a practical service experience. Adjustable lower rollers have built-in ball bearings, roll gently, keep the two sides of your door balanced and stable, require little installation space, glide quietly, and offer more maneuvering space for better operation. Refers to the door. Adjustable Roller Position: Barn door hardware fully adjustable for barn doors of various thicknesses, use the rollers to adapt to your door panel by adjusting the roller position in the rail, adapts to most of the retractable doors in your closet, its stable structure is more suitable for barn doors and sliding doors. Application: Narrow, with cabinets or large wall openings, and can be used in barn doors, cabinets, TV furniture, fences, salons, bedrooms, windows, kitchens, warehouses, and many other scenes. It has a wide range of uses and is ideal for choosing sliders. Size: 10*4*5 cm Note: Data is all measured manually, please allow an error of 1 to 3 cm due to light differences and display, there may be color differences, please refer to the actual item received.