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Cobalt Drill Bit - 5/16" Jobber Length. Also known as standard length drills, jobber drills are the most popular and widely used lengths that can be used in portable and machine drilling. The 5/16" drill bit is 4-1/2" in length.
These cobalt drill bits have a 135° split point making them ideal for drilling through tough materials by hand. The 135° tip angle and the split point virtually eliminates drill “walking” when beginning a drilled hole.
Sizes available include:
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