D/a29jcopc 29 Piece M42 Cobalt Drill Bit Set In Round Case 1/16 1/2 X 64ths
They are manufactured to Aerospace Standard 907 and display high red hardness, permitting speeds up to 30% greater than with conventional M2 high speed steel. Cobalt steel provides extended tool life compared to high-speed steel drill bits, and maintains the tool’s toughness and hardness in high drilling temperatures.