A 12mm drill bit is a versatile tool for wood, metal, and plastic. Learn its uses, types, benefits, and care tips for accurate and long-lasting results. What is a 12mm Drill Bit? A drill bit is a tool that, when paired with a drill, will cut holes. The dimension of the drill bit is equivalent to the width of the hole. A 12 mm drill bit would indicate that the hole made would be 12 m... https://www.jaibros.com/products/key-type-drill-chuck-1-13mm-jt6-taper-heavy-duty-pack-of-1