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 36' to 73', Width of 20' to 40', and a thickness of 3/4' and greater (Actual Frame Length: 35.5' to 53', Frame Height: 27.6' to 45.8')