german steel rules!
while working in a shop where we fabricated buckets for loaders and backhoes from stock, we found that the drill bits just don't hold up in 3/4 stock at all. none of them. oiled or dry same result. later on my boss bought a few very used german steel bits, some more than an inch wide. resharpened and cleaned up they have lasted over 3 years without breaking or bending at all. then I bought a set from 1/16 to 3/8 , german steel, and they have not needed a sharpening yet. they did cost more though. it was worth it to finish the jobs without shopping trips.