The Coffeebit - a drillbit for your coffee grinder

Vine here: https://vine.co/v/O5bIvBMMUD7
My buddy has a Grindripper wholebean pour over travel kit.
Like this: http://espressounplugged.com/grindripper
Only problem is, sometimes I want coffee now!
We have one of those mini Milwaukee drills with the quick-release, so I made an adapter to make the Grindripper just a tad more awesome.

I made the pentagonal hole for the grinder 7.3mm from apex to midpoint of the opposite side (the line that would divide the shape in half).

The drill-b