Smooth Metal Bearing: The bottom wheel adopts metal bearing, which is more stable and heavier. The concave wheel design is more consistent, the bearing shaft is smooth and round, and there are no scratches on the slip. High quality material: Stainless steel panel, thickened panel thickness up to 1.5mm, thick material, not easy to deform, can be used in humid environment, durable rustproof and corrosion resistant. Function of autonomous cleaning: Each activity automatically cleans and refuses dust accumulation and stagnation, which effectively prevents dust from entering and is more durable. Suitable for kitchen cabinets and cabinets of various styles. Simple structure: Quick installation button, upper guide wheel adopts copper button, retractable upper wheel is convenient for door leaf installation. Cylindrical catheter, horizontal rotation structure, smooth sliding without jamming. Color: silver Size: 7.5*4cm Weight: 100g Package includes: 2 sets of sliding door wheel kits, which can form two pulleys. It is recommended to install 2 to 4 pulleys per cabinet door.