Combined drills and countersinks are designed with spiral flutes to give long tool life and high quality center holes where accurate centering is essential to good quality for subsequent operations.
High speed steel (HSS) provides good wear resistance and can be used in general purpose applications on both ferrous and nonferrous materials.
Cobalt is harder than high speed steel and provides better wear resistance. It is commonly used on high tensile alloys.
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WARNING: This Product Can Expose You To Materials And/Or Chemicals Which Are Known To The State Of California To Cause Cancer And/Or Reproductive Harm.