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Irwin® 82°, 1/4", Countersink Drill Bit, Black Oxide, 5-PC Clam Set, #IR-1877791 (6/Pkg) | AFT Fasteners
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5pc Industrial Countersink Drill Bit Set 5 Flutes Counter Sink Woodworking Drill Bits Metal Working Chamfer Chamfering Cutter - AliExpress
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Countersink Drill Bit Set, 5 Pieces High Speed Steel 82 Degree 5 Flute 6mm Round Shank Mill Cutter Bit Countersink in Sizes 1/4” 3/8” 1/2” 5/8” 3/4” Set with Carrying Case. - Amazon.com
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