Grand Stands Sit-Stand Lady Bug Combo - Keyboard Tray, Slide-Lock Mouse Tray and Sit-Stand Arm Ideal for situations in which height adjustment above the work surface is required, the Mongoose 2 Dial Tilt Arm has a 14 1/3" total lift and lock height adjustment range (8 1/2" above mounting surface, 5 7/8" below) The patented Slide-Lock Mouse Tray eliminates "bounce" from the keyboard yet adds flexibility to adjust the mouse tray The Slide-Lock Mouse Tray adjusts without a tool for infinite positioning that is reversible for both right- and left- handed users. The Lady Bug Platform's unique curved design encourages elbows to stay close to the body and is perfect for corner applications