Features Keyboard Rail High quality material - study ans durable,Exquisite workmanship can used for a long time. Multi-layer plating - the polishing plating of surface has good oxidation resistance, is not easy to rust, beautiful and practical,high strength, high cost performance. Keyboard Rail Screw hole-can adjusted the height to install. Solid ball - smoother, more balance and quiet,Widely use Most people's choice, saving your work time. Slip pad - effectively reduces the damage caused by switch collisions.   Specification: Condition: 100% Brand New Material: Cold Rolled Steel Optional Color: White, Black Pull out the Total Length: 580mm / 22.8in Adjustable Length: 70mm / 2.8in Size: Approx. 356 * 32.5mm / 14.0 * 1.3in   Package List: 2 * Keyboard Rails 1 Set of Screws   Note: Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard Package List