These quality drill bits are sized for drilling Polymer80 pistol frames for their pins. This package includes one 3mm drill bit (approx 2.95-2.97mm) and one 4mm drill bit (approx 3.95-3.96mm).

We have a blog post where you can read more if you are interested - click here.

They are M35 cobalt high speed steel bits with 118 degree point and a straight shank.