I stopped in TSC today to check on my log catcher for my splitter and found a Kawaski 4.5" angle grinder on sale for $20 (4.2amp). I've been wanting one for around the house/car. Is this enough power? I don't want a large grinder but I want one powerful enough to grind metal or cut off a bolt. Do I need more amps or am I better w/a air cut off tool? Thanks!