Titanium Nitride Coated High Speed Steel Fractional Straight Shank Jobber Length Drill Bit 1/2" Size. 4-1/2" Twist Length. 6" Overall Length. Bulk 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