See a letter "A" on your drill bit? You're holding the first and smallest size in the letter-gauge drilling system. Perhaps unsurprisingly, this standardized series runs alphabetically from A to Z. On ...

1 - The Modding Toolbox: A Guide to Drill Bits 2 - Speciality Bits: Centre Drills and Countersinks 3 - Big Holes: Stepped Drills and Hole Saws Next Hello everybody, and welcome to what I hope will ...