3M Adjustable Keyboard Tray with Adjustable Keyboard and Mouse Platform - 19.5" Width x 10.5" Depth - Black - 1 Adjustable keyboard platform slides left and right. Basic knob-adjust arm controls both height and tilt. Gel wrist rest has product protection that inhibits the growth of microorganisms, such as . Height adjusts positive 1" and negative 4-1/2". Keyboard tray has a tilt range of positive 15 degrees to negative 15 degrees, 360-degree swivel and unlimited positions within height range. Mousing surface can be used to the left or right of the keyboard. Keyboard tray will work in standard workstations. Platform measures 19-1/2" x 10-1/2". Track length is 17".