ya dont use a grinder without the guard
if u dont beileve/ dont care about the death myth (this true iv seen plenty of exloding discs)
then it is alot cleaner as the splarks only go one way and they dont come toward u so u dont get metal imprinted into u and your cloths
also if u want i can explain what happens if a peice gets in your eye hint, it involes a micro drill, not kidding