MARXBORE Jobber Length Drill Bit, Heavy Duty, Series: 384, Imperial, 21/64 in Drill - Fraction, 0.3281 in Drill - Decimal Inch, 4-5/8 in Overall Length, 3-5/16 in Cutting Depth, Standard Flute, 3-5/16 in Flute Length, 21/64 in Shank, Straight Shank, 135 deg Point, Split/Self-Centering Point, HSS Cutting Edge, No Through Coolant, HSS, Oxide Treated, Applicable Materials: Alloy Steel, Aluminum Alloy, Cast Iron, Composites, Copper Alloy, Low Carbon Steel, Magnesium Alloy, Medium Carbon Steel, Plastic, Stainless Steel, Titanium Alloy, Tool and Die Steel