"hardened stainless steel" that they are probably using isn't actually that hard, a standard drill bit for metal should do fine, same with any standard metal tap.
For the drill, if you see lots of difficulty then you could use a cobalt steel one, but a standard HSS/high speed steel bit and tap should drill and thread perfectly fine.
For the drill, if you see lots of difficulty then you could use a cobalt steel one, but a standard HSS/high speed steel bit and tap should drill and thread perfectly fine.