Guhring Micro Precision Twist Drill, Series: 6401, 2.2 mm Drill Size - Metric, 0.0866 in Drill Size - Decimal Inch, 63 mm Overall Length, 7xD Cutting Depth, 3 Flutes, Spiral Flute, 19.8 mm Flute Length, 4 mm Shank, Straight/Reinforced Shank, 140 deg Point, 4-Facet Ground Hone Point, Right Hand Cutting, Carbide Cutting Edge, Carbide, Super-A Coated, Applicable Materials: Aluminum, Alloys, Brass, Cast Iron, General Steel, Stainless Steel, Titanium and Nickel Alloys and Universal Steel