Yeah, it's a random orbital sander clamped into an incredibly Janky stand. It rattles the shit outta the workbench, it's loud as hell, needs to be clamped down or it will literally run away on you...... But on the same token, it's savagely effective, works well when you've got a template glued on top (as the cutting action is down so you don't get the regular lifiting / fuzzies that you get with other sanders, and it leaves a nice 90 deg smooth surface. I wish I had money for one of those nice 12" disk sanders.... but... this was nearly free... and works pretty good....