If you have a Grizzly slow speed grinder this is an item you have to have. I can't say the same, however, about the grinder because mine had a grind wheel that was off center and wobbled so badly it was impossible to use. The replacement wheel was better but still wobbles side to side and the little carbide dressing "pen" is almost useless in dressing these wheels. My dressing stone was on back order for almost a year so I was happy when it finally arrived and I was able to get my wheel dressed enough that I can finally use it. If I had it to over, I would not buy the slow speed grinder but would probably buy a Work Sharp.