Originally Posted by Daniel Holzman
Stainless is usually very hard.For this case, I suggest a 1 inch hole saw with either titanium nitride teeth, or possibly sintered diamond teeth. You should be able to get the appropriate bit at a big box or a hardware store.
Since stainless steel is tough to drill, I would follow Daniel Holzman
's advice and use a titanium nitride (TiN)
coated 1" annular cutter (1 inch hole saw)
An annular cutter will bore through the SS making a smooth cut while removing the least amount of hard steel, unlike a regular twist bit that has to rip, tear, fold, spindle, and mutilate the work stock across the entire diameter of the bore hole.
Annular cutter #1
Annular cutter #2
For safety's sake, use a drill press if at all possible when boring a hole of this diameter. Clamp down your work stock tightly too.