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Made of the the highest quality cobalt and coated with titanium for longer life. All drills have straight shanks and are finished to drill quickly and cleanly. 15-1 lifetime usage over High Speed Steel twist drills, 5-1 lifetime usage over standard cobalt twist drills. More Heat Resistant than high speed steel and less brittle than carbide, works great on rough and uneven surfaces. Set includes #50, 53, 56, 57, 60, 70, 72, and size #76 drills.