I installed them on a wooden workbench. The screw holes line up, meaning that after I drilled the holes I can rotate the unit and the hols still fit perfectly. I needed longer bolts for my application so be prepared to purchase additional hardware. The racheting mechanic to raise and lower the wheels works very well and smooth. I push the workbench around on uneven ground and the wheels did fine. As a suggestion for improvement, I think the wheels can be bigger so it can clear obstacles easier. And longer bolts would be nice too especially for 2x4 wood installation. Recommended.