If you have to drill in hardened steel the Rodman bit's will work. They are like a masonary bit on steroids. I've drilled through hardened 440C and D2 with mine.
They have a couple guys at the National Farm Machinery Show in Louisville every year drilling through files, other drill bits, etc,etc. I always figured it was a joke and the stuff they were drilling had been annealed. Well I forgot to drill out a hole in a 440C knife blade before heat treat. I was over a my buddy Gil Hibben's doing the heat treat and it was during the farm show and I thought about that guy and decided I was going to take that blade down there with me and ask him to drill it. If he could drill it I'd buy a set and Gil said to buy him a set if it would. Well the bit turned cherry red and drilled through it with no oil. After drilling through it he proceeded to drill through a concrete block and continue on. I brought home two sets for us and a set for my brother. Gil messed up a couple trying to drill some damascus once but they warranteed them. They hard and soft let them grab and chip I think.
Do a search for Rodman multi purpose bit and they will probably come up.