I recently acquired some awesome 1/8" stainless steel plate (from a dumpster) Cleaned off the paint and cut out (with a die grinder and cutoff wheel) 2 nice tube monoblock chasis. I mounted transformers and I noticed that stainless really eats up a cheap drill bit quickly. I used my expensive MAC tools drills and had no problem. (at a reasonable speed) I need to drill some much larger holes now for tube sockets, and was wondering what the best tool for doing this is. I own a large drill press with a 5/8 chuck (16mm) but I need to drill or cut a clean 1-1/8" hole (several actually) Want advice on what others have used for this. Maybe something with replaceable cutter heads?