Features: 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. ; 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. ; Specifications:Quantity5Sizes19/64, 1/4, 5/32, 7/64 and 5/64"