Imperial - Black HSS Jobber Drill Set in ABS Plastic Case

• Bordo Black Knight M2 HSS Jobber Drills DIN338 And ANSI B94-11.

All About 118° Split Point (crankshaft point)

• The split point is self-centering and reduces the need for end thrust.
• Friction at the workpiece is reduced.
• 118° point angles are ideal for use in materials such as mild steel and cast iron.
• The 118° point creates easily controlled chips that are wide and thin.

All About Drill Bit Surface Treatment

• Black Finish Jobber Drills (also called blue finish) achieve their distinctive colour by steam tempering a thermal process resulting in a porous tool coating.
• This surface helps to keep lubricant on the tool particularly important on the cutting edges thus reducing friction and cold welding.
• The result is increased tool life.
• Black finish tools are generally recommended for ferrous applications where the oxide layer aids chip flow and heat dissipation.

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