Thanks for the info guys . We call them wafer wheels up here , but you better have a real good grinder to run them . I have brunt up as many as four Dewalt 4.5" ginders in a day running wafer wheels at work . We use them to cut pipe in places you can't use a torch or for materials you can't burn ( SS , Al. or copper ) . Very hard to get companies to send out a plasma cutter , most are afraid they would not get it back . In my own shop I use Metabo grinders , have had my present one for about six years now and use it almost daily ,it is just starting to get weak on me . Will buy a new one and use the old one to run wire wheels . I was looking at the plasma cutters and figured bigger is better . Dan