Norseman Drill Bits - High Speed Steel - Jobber Length
High-Speed Steel Drill Bits - Black Oxide NAS 907B
Type 190, Jobber Length, Heavy Duty
These 135° split point drills are self-centering and require less thrust in the drilling of harder metal than a general purpose drill. They are also surface treated with black oxide for increased wear resistance and lubricity to improve chip flow. They are recommended for medium hardness drilling applications.
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