| ABS Plastic. | 21 Pieces. | 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.