I use a 4" Mikita grinder with a diamond blade($17-$20 for blade/wheel). Best grinder on the market!!! I use mine every day and have only had to replace it 1 time in 20 years due to me dropping things on the cord! I have dewalt and Milwaukee tools and they r good, but I would never buy anything except a Mikita for a grinder! Period!!! Like i said I use it everyday cause I'm a plumber. I cut clay tile pipe, cast iron pipe, and ductile steel(3/4") when in a pinch and don't have chop saw with me. Don't waste your time buying any other blades other than a diamond blade! They sell adapters so uncan use wire wheels, etc.. Always use safety glasses and dust masks!!! Cannot stress last point enough!