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5/16" HSS Black & Gold KFD Split Point Jobber Length Drill Bit, Killer Force Drill Bit | KFD5/16 | DrillsandCutters.com
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HSS Cobalt Drill Bit Set 5/16 Inch 5Pcs M35 Co Twist Jobber Length Steel Metal Drill Bits - Amazon.com
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DEWALT 5/16-in 4-1/2-in Cobalt Alloy Steel Jobber Length Twist Drill Bit in the Twist Drill Bits department at Lowes.com
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