This is a ring that is perfectly engineered to indicate a level bit and brace. You can drill perfectly straight holes from one vantage point. This ring makes boring times just a bit more enjoyable. Because if you like it you should put a ring on it. It is made from 409 Stainless steel and is resistant to corrosion and scratches.
See how to use it here: https://www.youtube.com/watch?v=0660ESUV810