Precision Twist Drill Jobber Length Drill Bit, General Purpose Heavy Duty, Series: QC21PM, Metric/Imperial, 8 mm Drill - Metric, 0.315 in Drill - Decimal Inch, 117 mm Overall Length, 4XD Cutting Depth, 2 Flutes, Wide Land Parabolic Flute, 75 mm Flute Length, 8 mm Shank, Straight Shank, 135 deg Point, Split/Self-Centering Point, Right Hand Cutting Direction, HSS Cutting Edge, No Through Coolant, HSS, Bright, Applicable Materials: Alloy Steel, Ferritic+Austenitic, Free Machining Stainless Steel, Hardened/Tempered Steel, Lamellar Graphite, Magnetic Soft Steel, Martensitic, Graphite/Malleable Cast Iron, Plain Carbon Steel and Structural Steel/Case Carburizing Steel