Drill Bit

First a lesson in net etiquette, typing in only capital letters is considered to be SHOUTING and is very rude.

Now I would expect that almost any set of carbide tipped drills will work fine on nearly any practical hole diameter to a reasonable depth. You may be able to get away with High Speed Steel drills if you go slowly and remove only a small amount of material on each bit by starting with a small diameter hole and stepping up a little each time. For obvious reasons do not use any of the variety of wood bit drills.

You provide so little information and ask such a basic question that I wonder if you should be machining anything.

Anything you bleedin' like so long as you KEEP THE NOISE DOWN! <Cough, splutter>

Shallow cuts are undesirable in machining SS (at least some types of it), because it work-hardens. Use a relatively slow rpm, a relatively fast feed rate, and lubrication. Cobalt bits are commonly used, but other types will also work (though they might not last as long.)

Stainless steel is notoriously tough on drill bits, compared to drilling trhu carbon steel. Make sure you use small increments in working toward the size that you need. And I assume you will be using a drill press, not a hand-held drill. You can break a wrist with a hand-held.