Adjustable keyboard tray for writing desk support desk with M computer mouse Description: Scientific Design: Adjustable, relieves body stress, relaxes wrist and arm joints and muscles, and works easily. High load capacity: The slide rail made of special stainless steel can withstand a load of 20 kg. Smooth slides: Ball guides are used for smoother. Strengthening jaws: The new jaws add two reinforcement ribs that are firmer and more stable. Easy to install and does not damage the table. Applicable: desk thickness 2.3-4.8 cm, tray extends from the edge of the table 22 cm. Specification: Material: metal; Size chart: S: 55x24cm/21.65x9.45inch M: 64x24cm/25.20x9.45inch L: 75x24cm/29.53x9.45inch The package includes: 1 piece computer keyboard shelf Note: 1. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3.