Cotytech Fully Adjustable Keyboard Mouse Tray Ball Bearing (KGM-3S-BB) Composed of tray, mouse tray (right or left hand) and wrist rest; extremely smooth movements with ball bearing mechanisms; Keyboard tray for all keyboard style; steel frame coated black; dimensions: 19.3" (L) x 11.2" (W) Arm adjust tilting angles: 25 up/40 down; keyboard tilting angle: 19; mouse tray rotation: 360; Height adjustment: 5.9" (150mm); Loading area depth: 4.9"-7.5" (125-190mm) (distance from bottom surface of desk to this unit after being installed) Spring mechanism enables instant height adjustments with no need of lever; Control and use your keyboard tray unit in easy ways; Meterials: solid steel & foam