IMHO, 7" is the "most popular". 4 1/2" is the "most handy". For lighter
metal, like up to 1/4" stock, the smaller grinder gets into tighter spaces.
If you're working with eye beams, you'll want a larger unit
Depends on what size angel you need to grind on. If it is an
archangel, then you may want to go with a 6" sidegrinder and a
lot of discs, because they are immortal. If you only have a
common angel or a cherub, then the 4" or 4-1/2" would be adequate.
If you have a fallen angel, such as satan, then you are on your
own. I have not found anything that will make a dent in those
except diamond impregnated discs on a stationary machine, but
then the problem is getting the fallen angel to the machine.
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