What end mill is this?

Can someone tell me what end mill is being used in this Vine?

https://vine.co/v/eza3qM0gzpm

He (@Zach_Kaplan ?) seems to be getting VERY fine detail.

That looks like a single-flue engraving bit, probably a 30-degree inclusive… I’d guess this one:

I think it was a 1/32" fish tail bit but I can’t remember for sure.

Man that looks big by comparison to the collet nut for a .125 shank!

Thanks all.