What tooling to drill lots of 10mm holes 45mm deep?

[AlanMJackson]

Much quicker to drill just past half way with No or few Peck's then flip material and use same G-code.

That's basically what I'm doing now. Thanks for the reassurance.

I haven't found the drill / counter bore combination I'm looking for yet. I'm looking for 10mm drill with 16 or 18mm counter bore. The largest I can find so far is 6mm drill with counter bore from trend. All the larger ones I've seen have a smooth short pilot just to locate the counter bore in the hole but not to drill it.