Hum - think it was said before - the numbers .....80...1 were wire drills.
Based on the needs of the wire industry - Music uses a lot of wire!
The letter drills are large. I suspect they are cabinet and machine need drills.

Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Life; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/


Joe AutoDrill wrote:
They fill in gaps that were left by the other sets.

Except the "E" drill, anyway.

Absolutely... But it doesn't explain why they are called out by numbers and
letters. It seems like someone created the idea and for some reason, a
bunch of people got together and supported the idea even though *someone*
had to be logical enough to see that a decimal based system would be easier
to track, understand, etc.

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