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in regards to drill bits what do letters R, S, U etc mean?

2006-09-17 18:36:19 · 1 answers · asked by jesse 1 in Games & Recreation ➔ Hobbies & Crafts

1 answers

I believe it has to do with the size of the drill.
http://en.wikipedia.org/wiki/Drill_bit_sizes

2006-09-17 18:55:20 · answer #1 · answered by Twisted Maggie 6 · 0⤊ 0⤋

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