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 ...

We first spotted the Proxxon TBM115/TBM220 drill press in the window of a local shop. Its tiny size and adjustable speed seemed ideal for drilling circuit boards. At $200, this is one of the ...

Oh, sure – when you buy a new set of drill bits from the store, they come in a handy holder that demarcates all the different sizes neatly. But after a few years when they’ve ended up ...