Feature 1 Screw hole-can adjusted the height to install 2 Solid ball - smoother, more balance and quiet 3 Slip pad - effectively reduces the damage caused by switch collisions 4 High quality material - study ans durable 5 Multi-layer plating - the polishing plating of surface has good oxidation resistance, is not easy to rust, beautiful and practical Features: 1. Screw hole-can adjusted the height to install 2. Solid ball - smoother, more balance and quiet 3. Slip pad - effectively reduces the damage caused by switch collisions 4. High quality material - study ans durable 5. Multi-layer plating - the polishing plating of surface has good oxidation resistance, is not easy to rust, beautiful and practical Specification: Condition: 100% Brand New Material: Cold Rolled Steel Optional Color: White, Black Size: Approx. 356 x 32.5mm / 14.0 x 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