★Material: High-grade cold rolled steel with zinc plated finish makes precise thickness and smooth surface. It features soft close function, any drawer can be closed gently and silently. ★Product specifications: Drawer Length: 25-50cm/9.8-19.7in. Bottom installation. Package includes: One pair of slide rails. ★Anti-rust: The anti-rust ability and oxidation resistance of our slides is superior to the others because of the special galvanized blue sealing surface treatment; With dual industrial grade bearing ball inside,the drawers slide smoothly even though carrying heavy items. ★Multipurpose: Undermount Drawer Slides are intended for use with Face Frame or Frameless Cabinets. Soft close drawer slides are ideal for cabinetry, desk pedestals and general storage drawers. ★After-sales Guarantee: If you have any questions please contact me in time. We will provide you with satisfactory service.