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 sliding. High-quality material: Stainless steel panel, thickness thickened panel thickness up to 1.5mm, thick material, not easy to deform, can be used in humid environment, durable rustproof and corrosion resistant. Self-cleaning function: Each activity cleans and automatically refuses dust accumulation and stagnation, which effectively prevents dust from entering and is more durable. Suitable for cabinets and kitchen cabinets of different styles. Simple structure: Quick installation knob, the upper guide wheel adopts copper knob, the retractable upper wheel is convenient for the installation of the casement of door. Cylindrical catheter, horizontal rotation structure, smooth sliding without jamming.