art welding basics for noobs ep 3. This is all about the 4 1/2 inch angle grinder. This is one of the most important tools for working with steel. It cuts, grinds, cleans, polishes and more. I use a dewalt and highly recommend this brand or if you got bank Milwaukee they are even better . I have used Harbor freight and the cheap ones are alright but not as strong. Do not get the Magnesium series from harbor freight because mine burned out the first hour of use.