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. ; 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:Split Point135Diameter5/16" / 7.94 mmFlute Length81 mmOverall Length114 mm