Precision Twist Drill Aircraft Extension Drill, 1-Stage Type B Heavy Duty, Series: 501-6, #31 Drill - Wire, 0.12 in Drill - Decimal Inch, 6 in Overall Length, 4XD Cutting Depth, 2 Flutes, Spiral Flute, 1-5/8 in Flute Length, 0.12 in Shank, Straight Shank, 135 deg Point, Split/Self-Centering Point, Right Hand Cutting Direction, HSS Cutting Edge, HSS, Oxide Treated, Applicable Materials: Plain Carbon Steel, Alloy Steel/Hardened and Tempered Steel, Free Machining Stainless Steel, Austenitic, Ferritic + Austenitic, Martensitic, Lamellar Graphite, Nodular Graphite/Malleable Cast Iron, Unalloyed Titanium, Alloyed Titanium, Nickel