Adjustable keyboard platform feature unique modular platforms that adjust for different sized keyboarding surfaces. Use all three platforms or just one. Includes wrist rest for keyboard. Utilizes easy color-coded window for instant color adjustments. 11" arm for use with straight workstations. Color: Black; Workstation Type: Straight; Height (+/- Desktop): +0"/-6"; Keyboard Tray Dimensions (W x D): 21 1/4" x 10" or 30 1/2" x 10".