Irwin (928) 63920 Titanium Nitride (TiN) High Speed Steel Fractional Straight Shank Jobber Length Drill Bit - 5/16"

639 Series. Titanium nitride coating extends the life of the bit; lasts up to six times longer than standard high speed steel drill bits. Heavy-duty web design provides extreme rigidity when drilling in metal applications. Shorter cutting lips reduce torque when drilling in high tensile strength materials. 135-degree split point reduces feed pressure for easier penetration without work hardening. Carded. Size: 5/16". Decimal Equiv: .3125. Flute Length: 3-3/16". Overall Length: 4-1/2".