This has never been used. I bought a pair of them a few years ago and had lofty ambitions to put a grinder wheel on one and a cut-off wheel on the other. It's easy enough to swap the wheels, so I never bothered setting up the second. Please note that this does not come with instructions or the spanner wrench (I have a teenage son and who knows what he did with the packet. The operation of this is pretty straightforward, and a YouTube video can get you started fast if you need help. Harbor Freight and Amazon both sell generic grinder spanner wrenches for less than $10.