Active Workstation Legs: Designed for DIY tables, this ergonomic standing desk frame gives you the height adjustment you want with customization options (table top must be purchased separately) Compatibility: Recommended Tabletop Sizes - Length of 37 to 80, Width of 23 to 43, and a thickness of 3/4 and greater (Actual Frame Length: 36.8 to 59.7, Frame Height: 27.6 to 45.7)