Drill bit to make a female 14mm tapered hole for GonG parts

I'm looking for what's described in the title. I want one to polish and make uniform my existing 14mm gong stuff, and make some holes in a wood stand for displaying bowl pieces, etc. I know I'd also need the opposite sex bit to make all my stuff truly uniform - we'll see if the price isn't arm+leg.

I also have this female universal size nail and it's barely too small for 14mm - I was hoping to bore it out a little bit with the gentle guided help of a drill press with said drill bit.

I've tried googling this bit based on it's function and form factor but I can't find the keywords to even start shopping!! WTF is this thing called? Thanks FC

Hey @xRUFUSx, I did a quick google search and found this site.. This should help you get your search going, they have male and female bits.. I found it from this google image search...
Good luck dude.. Let us know how it goes for you!

@Buildozer GRIND. Yes. Since I'm so jaded I'll add that I'm renaming drill press to grind press while I use it as such haha.

Thanks again for the pointer!