Space-saving tray requires only 1U (44.45 mm), providing more space for mounting electronics. Ball bearing slides for smooth operation. Locks in open position, and retracts when not in use. Holds up to 16.37”W x 7.67”D (415.8 mm x 194.8 mm) keyboards. Mounting hardware not included. Keyboard tray extends 11” (280 mm) for full access to all keys. Made of strong, lightweight aluminum.