Bordo HSS-Co5 Cobalt Tough Drill Refill Set DIN388

• Bordo fractional cobalt tough HSS-Co5 Jobber Drill DIN388.
• HSS-Co5 (Cobalt) Drill Refill Set 1.0-6.5mm x 0.5mm increments.
• Ideal for replenishing Bordo metric Cobalt jobber drill sets.

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 135° point should be used 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 steel.

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.