The Number & Letter Gauge drill bit sizes are very similar to American Wire Gauge (only in the representation but not the actual gauge numbers). In the U.S., Fractional Inch and Wire Gauge & Letter are very common whereas in the rest of the World, the metric drill bit sizes are predominant.ĭefined in the ANSI B94.11M-1979 Standards, the fractional inch drill bit sizes start from 1/64 inch and scale up all the way to 1inch with 1/64inch increments. Just like other gauges, the Drill Bit Sizes are also defined as per different international standards. But unlike spade bits, Forstner bit make flat bottoms. This bit also helps you make wider holes, just like spade bits.
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