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Irwin 5-Piece Left Hand Drill Bit Sets, M-42 Cobalt High-Speed Steel, 5/64" to 19/64" Cutting Diam, #30520 (5/Pkg) | AFT Fasteners
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Irwin 3016032 1/2 Inch Cobalt High Speed Steel Drill Bit: Cobalt Drill Bits 23/64 To 1/2 Inch (024721067234-1)
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IRWIN Drill Bit Set, M35 Cobalt Alloy Steel Steel, 29-Piece (3018002) - Metal Cutting Drill Bits - Amazon.com
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Irwin® Cobalt High Speed Steel Drill Bits, 7/16" X 5 1/2", Split, Carded, #IR-3016028 (3/Pkg) | AFT Fasteners
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