Mars-Tool 2-Pack Solid Carbide Drill Bit for Hardened Steel Hard Ness HRa 91

2/Pack Solid Carbide Drill Bit for Hardened Steel Hard Ness HRA 91.3 Aerospace Standard K20 Tungsten Carbide Jobber Length Twist Drill for Metal 118

For precision drilling of tight tolerance holes, and materials 40 Rockwell or higher. Diameter tolerance is +.000/-.0005.