After struggling to drill out a broken stud on an exhaust flange I’m in the market for some better drills. Laying under the car is not my idea of fun so I want something that will zip through materials commonly found on automobiles as quickly as possible. Looks like the choices are High Speed Steel, cobalt, and carbide. Or maybe I should just buy inexpensive drills and treat them as throw aways? What are the pros and cons of each? For example I understand that carbide tends to be brittle. What is everyone else using with good success?