From Revain.com. Wow, this worked beautifully - right out of the box: no vibration, strong motor (5 amp), smooth operation when used and seems to have some pretty solid components After first use just to try it out I changed the wheels, I suggest swapping out the medium quality grinding wheels (most under $200 bench grinders come with medium or low quality wheels) For example have I bought thinner discs (3/4" thick) from SAIT/United Abrasives to replace them. For fast spinning grinders, I only use quality components, in this case the 8" SAIT wheels on this tool, which are a add that extra level of security/durability that I want.By the way, to fit thinner wheels I had to buy eight shims with 5/8" holes to get the right A distance for each wheel with four washers on each side. So I'm very happy with this purchase (less than $60) and have the original grinding wheels as spares.