ERGONOMIC DESIGN]Improve wrong sitting positions with this height-adjustable keyboard tray, fully support the to relax the upper limbs and improve working conditions. SPACE-SAVING]Built-in smooth slide rails slide in or out smoothly and quietly, hiding your keyboard, mouse, and other gadgets under your desk, freeing up more space for your desk. APPLICABLE SCENARIOS]The under desk shelf can hold a variety of different office or everyday items. It is suitable for home, apartment, dorm, office. EASY TO INSTALL]No tools required for installation, the clip design is convenient and quick to install without damaging your desktop, just clip it directly on the edge of the table. Color: As Shown Material: Density Board Package Contents: 1*Desktop extension board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.