Today i came across a Dewallt XR 20v brushless drill and impact driver set for $100.  I was really wanting a good drill so this impact driver is just bonus but I am not familiar with it.  What instances would I use the impact driver over the drill?  The drill has a setting switch that is either1 or 2, what is this?   There is also a dial setting that goes from 1-15, how exactly do I know which setting to use?
			
			 
				
		 
			 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		
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