Precision Twist Drill Jobber Length Drill Bit, General Purpose Heavy Duty, Series: HX15, Imperial, X Drill - Letter, 0.397 in Drill - Decimal Inch, 5-1/8 in Overall Length, 4XD Cutting Depth, 2 Flutes, Spiral Flute, 3-3/4 in Flute Length, 0.3969 in Shank, Straight Shank, 135 deg Point, Split/Self-Centering Point, Right Hand Cutting Direction, HSS Cutting Edge, No Through Coolant, HSS, Purple/Bronze, Applicable Materials: Magnetic Soft Steel, Structural Steel/Case Carburizing Steel, Plain Carbon Steel, Lamellar Graphite, Alloy Steel/Hardened and Tempered Steel, Free Machining Stainless Steel, Ferritic + Austenitic, Martensitic, Titanium Unalloyed, Alloyed Titanium and Nickel Unalloyed