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?
