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:18 inch (457mm); Runner Length:18-1/2"(470). Cabinet Depth Range:20-9/16"(522)-18-7/8"(479). Weight Capacity: 85 lbs. Package Includes: Selected Slides, Adjustable Locking Device, Mounting Screws, Installation Instructions. Function: 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. High load rating allows you to install these slides on any type of drawer. Good Quality: If there is any quality problem with your purchasing, please contact us. We will issue refund or send a replacement.