Precision Twist Drill Screw Machine Drill, General Purpose, Series: R40, Imperial, 21/64 in Drill - Fraction, 0.3281 in Drill - Decimal Inch, 2-15/16 in Overall Length, 2.5XD Cutting Depth, 2 Flutes, Spiral Flute, 1-11/16 in Flute Length, 0.328 in Shank, Straight Shank, 118 deg Point, Conventional Point, Right Hand Cutting Direction, HSS Cutting Edge, HSS, Bright, Applicable Materials: Alloy Steel, Brass, Bronze, Copper, Free Machining Stainless Steel, Ferritic + Austenitic, Graphite/Malleable Cast Iron, Hardened and Tempered Steel, Magnetic Soft Steel, Nickel, Plain Carbon Steel, Structural Steel/Case Carburizing Steel and Titanium