Hello all,

I used to work in avionics a few years ago and we used to have a tool that I cannot seem to find or identify with a name.  Let me describe it:

Let's say you're attaching a ring connector to part of the frame (for a ground).  In order to remove the paint or other coatings, you attach this abrasive device to a drill.  The device has a pilot point on the end, which rides in the hole you previously drilled and makes a perfect circle of clean metal for good bonding.

What's that thing called and where can I buy one?

Thanks!

-
Matthew