This is a reasonable mobile base.  I have purchased several of these for tools I own that are weird sizes - e.g., a large Grizzly Band-saw, a large router table, and a Grizzly spindle sander.  I like the design as it's simple and sturdy, as long as you use 2" aluminum square stock and not wood. I first tried one of these bases with the wood they recommend and it's worthless, far too flimsy for anything but a light tool.  I bought 2" x 1/4" wall square aluminum stock and have had excellent results.  Needless to say aluminum costs more than wood, but it's worth it and with it, these are great bases.