What is the usage senario differences between these (link below) three right angle drills from Milwaukee. I know one is fixed speed 500 RPM, another 0-500 RPM variable, and the third is 0-600 PRM variable. Seeminly quite similar - but which would one select for what usage, and why?
http://www.milwaukeetool.com/Produc...uctId2=3107-6&CategoryName=right-angle-drills
http://www.milwaukeetool.com/Produc...uctId2=3107-6&CategoryName=right-angle-drills