What Does The Letter 'A' Stand For On A Drill Bit?

You can find drill bits with imperial and metric units printed on them, but what about letters? Here's what an A (or B and so on) on a drill means.
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Shree Steel Wire Ropes Ltd (SHSW)

Access our live advanced streaming chart for Shree Steel Wire Ropes Ltd stock, free of charge. This unique "area" or candle chart enables you to clearly notice the movements of this Shree Steel Wire ...