Dormer Jobber Length Drill Bit, Type N General Purpose, Series: A012, Imperial, #21 Drill - Wire, 0.159 in Drill - Decimal Inch, 3-1/4 in Overall Length, 4XD Cutting Depth, 2 Flutes, Spiral Flute, 2-1/8 in Flute Length, 0.1591 in Shank, Straight Shank, 118 deg Point, Split/Self-Centering Point, Right Hand Cutting Direction, HSS Cutting Edge, No Through Coolant, HSS, TiN, Gold, Applicable Materials: Aluminum, Alloy Steel, Copper, Magnetic Soft Steel, Magnesium and Lamellar Graphite