Drillco 60 Pc. HSS Jobber Drill Bit Set Spiral Flute 118 Degrees Conventional Point Size #1 - #60 200A60High speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge Round shanks allow use with a wide variety of toolholding systems When run in a counterclockwise direction (right hand cut) spiral fluted tools evacuate chips up and out of the