Bordo Left Hand Jobber Drill Set

• HSS-Co5 (Cobalt) Left Hand Jobber Drill Set.
• Set includes 19/64", 1/4", 5/32", 7/64", and 5/64".

About Bordo Fractional Left Hand Cobalt Tough HSS-Co5 Jobber Drill

• 135° Split Point (crankshaft point).
• Split point is self centering and the short distance from the drill axis to the outer corners results in faster penetration, reducing the need for end thrust.
• The 135º point should beused to cut harder steel materials especially in deep hole applications.
• In these situations it will produce thicker chips minimising work hardening of the cavity.
• Faster penetration reduces abrasion and friction along the cutting edges.
• Cobalt HSS jobber drills are extremely hard and provide superior performance and increased tool life especially in stainless steel and high tensile stee

Usage

• Left Hand jobber drills are ideal for use with screw extractors to remove broken bolts and screws.

Drill Bit Surface Treatment

• Bronze Finish (gold oxide). The metallic brown coloured low temperature temper treatment is normally only used on cobalt tools for identification purposes.