ACCO BRANDS, INC.-PLATFORM,KEYBOARD ADJ,GY. Adjustable Keyboard Platform with SmartFit System, Black. Adjustable keyboard platform feature unique modular platforms that adjust for different size d 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(s): Black; Keyboard Tray Dimensions (W x D): 21 1/4" x 10" or 30 1/2" x 10"; Mouse Tray Dimensions (W x D): Incl. in Keyboard Platform; Height (+/- Desktop): +0"/-6".