Great solution for my milling machine. Multiple holes had to be drilled and tapped in the base to accommodate the 3 contact points rather than the 1 point the mill base was designed for, resulting in a sturdier construction. This left the individual holes for anchoring in the ground free when they didn't need to be moved. They are well built and easy to raise and lower even under weight. Roll slightly, then once in place, turn the thumbwheels to align and lock. In the near future I will buy another one for a lathe.