SGS Short Length Drill Bit, High Performance Triple Margin, Series: Hi-PerCarb 131N, Imperial, #21 Drill - Wire, 0.159 in Drill - Decimal Inch, 2.5984 in Overall Length, 3xD Cutting Depth, 3 Flutes, Spiral Flute, 0.9449 in Flute Length, 0.2362 in Dia x 1.4173 in L Shank, Standard Shank, 124 deg Point, Pyramid Point, Right Hand Cutting Direction, Carbide Cutting Edge, Carbide, Uncoated, Applicable Materials: Aluminum, Composites, Non-Ferrous and Plastic