Workbench height adjustable feet

I made a workbench for my mitre saw and small table saw and used 2x4 lumber as frame and legs. Found my Garage floor to be uneven and made these height adjustable feet to solve the problem. 

Use M10 bolts and nuts for adjustment and attach with wood screws to legs. You would have to drill a > 10 mm hole in the leg for the bolt to move in/out without catching in the leg.