A. Quantity: 4 pieces B. Color: Black C. Wheel diameter: 30 mm D. Aperture: 6 mm E. Material: Nylon and alloy F. Mounting plate size: 85 x 45 mm G. Silent nylon rollers: The wheels are equipped with nylon wheels that tend not to cause scratches when sliding and are relatively smooth. One can open and close the door in a comfortable and quiet way. H. The sliding door wheels are made of nylon, bearings and alloy substrates. The surface is coated with multiple layers of baking paint, having a relatively thick coating, which is less likely to rust, wear-resistant and durable, and can be used for a certain period. I. Height adjustable: The telescopic upper wheel is easy to install, and the height can be adjusted, being suitable for various indoor doors and windows. It has a cylindrical conduit and a horizontal rotation structure, allowing for smooth sliding. J. 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. It is recommended to install 2 - 4 pulleys on each cabinet door. K. Multiple uses: The multi-functional sliding wheels are suitable for cabinets, windows, wardrobes, cupboards, display cabinets, etc.