Upgraded Version: Adjustable floor guide and wall-mounted. It ensures the stability and smoothness of the sliding door. The smooth roller will not damage your door. Beautiful and practical. And thanks to its easy installation, it is perfect for both experienced and inexperienced users. Material: The sliding door rollers are made of heavy-duty steel and the outer parts are made of nylon to ensure excellent product quality. The external bearings provide a smooth surface that reduces the friction caused by iron sliding doors. In addition, they provide durability and impact resistance. Humanization: 1. Hot-dip galvanizing, 2. Zinc layer thickness: 120g 3. Salt spray test time: ≥ 72 hours (no rust) 4. Error: ≤ 50mm. Application: Electric Door Interior Wheel/Sliding Door Nylon Sleeve Wheel/Iron Door with Wheel/Electric Door Guide Wheel/Guide Wheel/Pulley. Easy to Install: The barn door roller kit keeps the door perfectly balanced on the guide, preventing it from wobbling. The rollers can