Metal smooth bearings: The bottom wheel uses a more stable and heavier metal bearing. The concave wheel design is more uniform, the bearing shaft is smooth and round, and the sliding has no scratches. High-quality material: stainless steel plate, thick plate thickness up to 1.5mm, thick material, not easy to deform, can be used in humid environment, durable and corrosion-resistant. Closed cleaning function: Each activity automatically cleans dust deposits and stagnation, effectively preventing dust from entering and increasing durability. Suitable for cabinets and kitchen cabinets of various styles. Simple structure: quick-mounting button, upper guide wheel adopts copper button, retractable upper wheel is convenient for door leaf mounting. Cylindrical catheter, horizontal rotation structure, smooth sliding without jamming. Package includes: 2 sets of sliding wheels, which can form two pulleys. It is recommended to install 2-4 pulleys per cabinet door.