The versatile Stealth Platform (bottom) can be used for a keyboard only (center), right or left hand mouse or both at the same time. Houdini Adjustable Arm - 18 Deep Glide Track (top arm) Lift-N-Lock height adjustment, Height Range 3" above 5" below work surface (8 in), Tilt Range: -20° to +10°. Fits corners and desk returns down to 19" also! 

Stealth 20"W x 13"D, Sliding mouse tray: 8.5"W x 10"D 
Houdini TM simplifies your choice of keyboard arms, because it works just about anywhere and does just about anything. Short return? Corner work surface? No problem! The Houdini pulls out far enough to work in a corner, but still retracts fully on a short, 17 3/4" track. Position indicators for both height and tilt Soft-touch wheel allows convenient, stable, one-hand tilt adjustment