Broken water pump bolt removal

Man, I bought a set of left hand drill bits on ebay for like 15.00 for removing broken bolts and do they work great....best 15 bucks I ever spent.....I am a full time maintenance mechanic and they never let me down yet.....You must have a drill that goes in reverse....then just drill into the broken stud as if you were drilling a regular hole....and it unscrews itself....amazing....I use to use those Easy outs and man , they suck....never had any luck with them