Fractional Sizes

Fractional Sizes:
1/16 | 5/64 | 3/32 | 7/64 | 1/8 | 9/64 | 5/32 | 11/64 | 3/16 | 13/64 | 7/32 | 1/4 | 9/32 | 5/16

These drills, of very short overall flute length, have been designed for centering work, where their extreme rigidity would reduce runout and eccentricity. For the same reason on larger sizes, they have been quite successful as starting drills in screw machine drilling.

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