In reply to thephantombolter:
Any old drill that can make a hole in rock will do.
Much more important is the type of glue to use to hold the hangers in place.
I recommend the stuff branded "Bostik".
Never, N-E-V-E-R, never just stick the hangers on to the rock with Blu-tac.
This would be very dangerous. Although Blu-tac is sometimes used for trad placements it really isn't strong enough for sport.
Post edited at 22:22