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DRILL BITS *Sub Brand: THUNDERBOLT *Diameter: 7/16 in. *Overall Length: 12 in. *Material: Black Oxide *Style: Aircraft Length *Product Type: Drill Bit *Number in Package: 1 pc. *Shank Diameter: 3/8 in. *Shank Type: 3-Flat Shank *Usage: Deep drilling into metal, wood and plastic *Packaging Type: Carded *Finish: Black Oxide *Design: Aircraft Length *Flute Length: 4-1/16 inch *Flute Length: 3-5/8 in. *135-deg. split point tip starts on contact to prevent walking * Black oxide coating provides lubricity and resists corrosion *Extended length for hard to reach areas *Discovery ACC, CON, NBR, SUP, EXP