Overall this is a good product and tool. I would give it 5 stars if it came with a small thin wrench to tighten the grinding wheels as my wrenches were too thick to fit between the grinder and the wheel so I had to run out and buy a much thinner wrench. All my tractor deck knives and bush knives as soon as I got this sharpener and it worked fine. I'm left handed so I was happy to see that the handle can be attached to either side of the grinder.