Drill Bit Sizes
Drill bits are the cutting tools of drilling machines. They can be made in any size to order, but standards organizations have defined sets of sizes that are produced routinely by drill bit manufacturers and stocked by distributors.
In the U.S., fractional inch and gauge drill bit sizes are in common use. In nearly all other countries, metric drill bit sizes are most common, and all others are anachronisms or are reserved for dealing with designs from the US. The British Standards on replacing gauge size drill bits with metric sizes in the UK was first published in 1959.
A comprehensive table for metric, fractional wire and tapping sizes can be found at the drill and tap size chart.
Read more about Drill Bit Sizes: Metric Drill Bit Sizes, Fractional-inch Drill Bit Sizes, US Number and Letter Gauge Drill Bit Sizes, Drill Bit Conversion Table, Screw-machine-length Drill, Jobber-length Drill, Long Series Drill Bits, Center Drill Bit Sizes
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Eagle with crest of red and gold,
These men were born to drill and die.
Point for them the virtue of slaughter,
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And a field where a thousand corpses lie.”
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When all was said and done,
A little bit of everything,
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—Robert Frost (1874–1963)