Key benefits - Smooth and quiet operation: Built in double row steel ball bearings deliver smooth, precise, quiet, and stable sliding for a reliable keyboard mounting rail. - Protective design: Rubber bumper design helps minimize damage from collisions with the drawer stop. - Size options and full extension: Includes 2 pieces (one pair) in 300 mm (12 in), 350 mm (14 in), or 400 mm (16 in) lengths; full extension telescopic keyboard mounting rail with metal ball bearings; adjustable. - Flexible mounting height: Mounting brackets can be installed on the inside or outside of the cabinet, with height adjustable from 20 to 77 mm. - Durable construction: Drawer slides are made from high quality cold rolled steel, offering robustness, durability, and load bearing capability. Use scenarios - Office or home workspace: Install under a desk to create an ergonomic, space-saving keyboard tray that slides smoothly into reach. - IT and equipment cabinets: Use in server or equipment racks where a sturdy, full-extension keyboard rail is needed for frequent access and efficient use of space. - Workshop or control environments: Attach to cabinets or panels in workshops or control rooms to provide a reliable, height adjustable keyboard mounting solution that can withstand heavy use.