Seco Long Length Drill Bit, Imperial Universal, Series: SD1108A, 1/4 in Drill Size - Fraction, 6.35 mm Drill Size - Metric, 0.25 in Drill Size - Decimal Inch, 4.173 in Overall Length, 8xD Cutting Depth, 2 Flutes, Spiral Flute, 2.598 in Flute Length, 0.315 in Dia x 1.417 in L Shank, Cylindrical Shank, 140 deg Point, Self-Centering Point, Right Hand Cutting Direction, Solid Carbide Cutting Edge, Solid Carbide, TiAlN Coated, Applicable Materials: Cast Iron, Hard Materials, Non-Ferrous Metals, Steel and Stainless Steel