Ergotron 33-418-085 WorkFit-TL Sit-Stand Desktop Workstation, Black Work fit - tl Features a larger keyboard tray, wider work surface and higher weight capacity Add an accessory monitor mount kit: attach your displays) with a Riser to provide independent screen adjustment while clearing work surface space Modify an existing office space or cubicle by simply adding a Work Fit-TL to an open tabletop, without the cost of expensive Professional installers Ships fully assembled. Sits directly on top of desk - No special mounting or tool-adjustments required for Installation Provides 15 inches (38 cm) of vertical adjustment