Oh, sure – when you buy a new set of drill bits from the store ... it becomes useful to have some sort of gauge to measure them. [Caspar] has the solution, and all you need is an old steel ...

Drill bits can be supplied in one of four standard size units. These include English or fractional, metric, wire gauge, and letter size. An English drill bit is designed with base units of inches or ...

concentric design that minimizes detrimental vibration while drilling and thereby enhances operational efficiency. The versatile cutter blocks are capable of backreaming and feature gauge trimmers ...