The max clamping distance of the clamp is 2.1in, as long as your workbench has an exposed flat edge, it can be installed to use. Such as a desk, workbench, shelf, or table. 3 Color Modes & Stepless Dimmable Magnifier Lamp- Bulid in 72 pcs super bright LED,Long-lasting and Energy Efficient, 3 color modes( white, white&warm, warm) to choose.