Turbomax 3/8" Reduced Shank High Speed Steel Drill Bit 1/2" Size. 4-1/2" Twist Length. 6" Overall Length. Bulk. Revolutionary tip design stays sharper longer and drills up to 10x faster than other leading drill bits Three-flatted shank design provides better chuck grip and reduces slippage. Ideal for use in keyless chucks Bit is constructed of M-2 high speed steel for the best combination of strength, heat resistance, and wear resistance 3/8" reduced shank fits all 3/8" drills