Ergotron WorkFit-S 33-341-200 Dual Sit-Stand Workstation - Steel, Plastic, Aluminum - Black Helps counteract the harmful effects of increasingly sedentary work styles Promotes proper ergonomic positioning and a sit-stand work routine Get affordable ergonomics Desk Clamp attaches to surface edge 0.47 to 2.4 Inches thick Counterbalanced adjustment points allow instantaneous, tool-free re-positioning while you work Burn more calories by choosing to stand for periods of your work-day. Maximum LCD height adjustment of 23" (58 cm) for premium comfort