Precision Twist Drill Jobber Length Drill, General Purpose, Series: R18, Imperial, #21 Drill Size - Wire, 0.0669 in Drill Size - Decimal Inch, 3-1/4 in Overall Length, 4XD Cutting Depth, 2 Flutes, Spiral Flute, 2-1/8 in Flute Length, 0.159 in Shank, Straight Shank, 118 deg Point, Conventional Point, Right Hand Cutting, HSS Cutting Edge, No Through Coolant (Yes/No), HSS, Steam Tempered, Dark Gray, Applicable Materials: Magnetic Soft Steel, Structural Steel/Case Carburising Steel, Plain Carbon Steel, Alloy Steel/Hardened and Tempered Steel, Free Machining Stainless Steel, Ferritic + Austenitic, Graphite/Malleable Cast Iron, Titanium, Nickel, Copper, Brass and Bronze