Sturdy and durable: The silver finish is scratch-resistant and rust-resistant, ensuring long-term use indoors or outdoors. Made of durable plastic, the large rollers roll quietly and smoothly so they won't scratch your door. Adjustable design, convenient and quick to install: the gap can be adjusted freely according to the thickness of the door body, and it can be fixed by tightening the screws. Easy DIY without tools. Versatile: Guide wheels are designed for automatic doors, sliding doors, frame doors, wooden doors and metal doors. No need to drill holes in the wall, no mess. The design is very simple and beautiful 100% satisfied with the service: enjoy a smooth and hassle-free return service within 1 month. If you have any questions, please contact us.