Upgraded Version: Adjustable floor and wall guide. It provides stability and fluidity in the sliding door. the smooth roller does not sadden your door. Beautiful and practical. And thanks to its simplicity of installation, it is perfect for expert and non-expert users. Material: The wheels for sliding doors have been made of heavy duty steel and nylon outer parts to provide superior product quality. External bearings provide a smooth surface capable of reducing friction caused by sliding iron doors; In addition, they provide durability and impact resistance. Humanization: 1. Hot-dip galvanizing, 2. Zinc layer thickness: 120g 3. Duration of salt spray test: ≥72 hours (no rust) 4. Error : ≤50mm. Application: electric door in wheel / nylon sleeve wheel for sliding door / iron door by wheel / electric door guide wheel / track wheel / pulley. Easy to Install: The barn door sliding kit is able to keep the door perfectly balanced on the rolling guide, thus preventing swinging. The rolling wheels can also be used as a sliding door guide so that the sliding barn door hardware is noiseless and balanced. for sliding garage doors, interior door and gate.etc Uses: Nylon wheels as sliding door guide (2 units* 40mmx60mm) for sliding door, electric door, sliding rollers, garage, sliding doors, sliding door wheels, conveyor rollers or conveyor roller, pallet/pallet wheels, parts of worn roller replacement - Applications: industrial and general. lucky meet Note: The data is manual measurement, please allow 1-93cm error, due differences between light and screen, there will be a certain color difference, the specific received in kind prevail.