1. Quantity: 4 pieces 2. Color: Black 3. Wheel diameter: 30 mm 4. Aperture: 6 mm 5. Material: Nylon and alloy 6. Mounting plate size: 85 x 45 mm 7. Silent nylon rollers: The wheels are equipped with nylon wheels that are relatively quiet. They won't cause obvious scratches when sliding and offer a smooth experience. You can open and close the door relatively comfortably and quietly. 8. Materials: The sliding door wheels are made of nylon, bearings and alloy substrates. The surface is coated with multiple layers of baking paint, with a relatively thick coating. It is not prone to rusting, is wear-resistant and relatively durable, and can be used for a long time. 9. Height adjustable: The telescopic upper wheel is easy to install, and the height is adjustable, suitable for various indoor doors and windows. It has a cylindrical conduit and a horizontal rotation structure, allowing for relatively smooth sliding. 10. What you will get: 4 sliding door rollers, and the size of the sliding door accessories is 85 x 45 mm. The classic black-and-white color scheme can match your doors and windows relatively well. It is recommended to install 2 - 4 pulleys on each cabinet door. 11. Multiple uses: The multi-functional sliding wheels are suitable for cabinets, windows, wardrobes, cupboards, display cabinets, etc.