Improved: Adjustable floor and wall guides ensure stable and smooth sliding of sliding doors. Their smooth-rolling rollers do not damage the door. Aesthetic and practical. Easy installation, suitable for both professionals and amateurs. Material: Sliding door rollers are made of heavy-duty steel with nylon outer components, ensuring superior quality. The external bearings provide a smooth surface, reducing friction caused by iron sliding doors; they are also durable and impact-resistant. Easy to use: 1. Hot-dip galvanized. 2. Zinc coating thickness: 120g. 3. Salt spray test time: 72 hours (rust-proof). 4. Error tolerance: 50mm. Applications: Interior rollers for electric doors, nylon sleeve rollers for sliding doors, guide rollers for iron doors, guide rollers for electric doors, guide rollers and pulleys. Easy Installation: The sliding door kit keeps the door perfectly balanced on the guide rails, preventing any wobbling. The rollers also serve as sliding door guides, ensuring quiet and balanced operation of sliding barn doors. Suitable for sliding garage doors, interior doors, and gates. Uses: Nylon rollers as sliding door guides (2 pieces of 40 mm x 60 mm), for sliding doors, electric gates, sliding rollers, garage doors, sliding gate rollers, conveyor rollers, pallet/tray rollers, replacement parts for worn rollers | Applications: Industrial and general use.