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ORXPLUS Tools 5 Flute Metal Countersink Drill Bit, 87 Degree Quick Release Shank Fits for 1/8"-3/4"(3mm-19mm) - - Amazon.com
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CONQUER Tools 5 Flute Metal Countersink Drill Bit, 90 Degree for 1/4'' Hex Shank Fit 1/8"-3/4"(3mm-19mm), Burr Removal, Deburring Beveling Chamfer Tool, Holes Shaping Trimming, Inner/Pipe Reamer - - Amazon.com
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IRWIN 73830 Jobber Drill Bit, 15/32 in Dia, 5-3/4 in OAL, Spiral Flute, 2- Flute, 15/32 in Dia Shank, Reduced Shank | HardwareStore.com
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