Precision Twist Drill Jobber Length Drill Bit, General Purpose Heavy Duty, Series: QC21P, Imperial, #20 Drill - Wire, 0.161 in Drill - Decimal Inch, 3-1/4 in Overall Length, 4XD Cutting Depth, 2 Flutes, Wide Land Parabolic Flute, 2-1/8 in Flute Length, 0.166 in 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/Hardened, Austenitic, Ferritic+Austenitic, Free Machining Stainless Steel, Magnetic Soft Steel, Martensitic, Nodular Graphite/Malleable Cast Iron, Plain Carbon Steel, Structural Steel/Case Carburizing Steel and Tempered Steel