Irwin 81110ZR Irwin 81110ZR Jobber Drill Bit, 0.194 in Dia, 3-5/8 in OAL, Spiral Flute, 4-Flute, 0.194 in Dia Shank

Shank Diameter: 0.194". Used where more precisely sized holes are required. Drills exact hole size, ideal for tapping. Bit is constructed of M-2 high-speed steel for the excellent combination of strength, heat resistance and wear resistance