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Irwin - Step Drill Bit: 1/8 to 1/2″ Dia, 1/4″ Shank Dia, Cobalt, 13 Hole Sizes - 82688730 - MSC Industrial Supply
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Irwin - Step Drill Bit: 3/16 to 1/2″ Dia, 1/4″ Shank Dia, Cobalt, 6 Hole Sizes - 06560627 - MSC Industrial Supply
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Amazon.com: IRWIN Step Drill Bit, 1/8-Inch to 1/2-Inch Step, 1/4-Inch Shank (10231) Silver|Silver metallic : Industrial & Scientific
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IRWIN Unibit 3-Piece Set Step Drill Bit Set (3/16-in to 7/8-in) in the Step Drill Bits department at Lowes.com
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IRWIN Unibit 3/8-in 2-Step Drill Bit (7/8-in and 1-1/8-in) in the Step Drill Bits department at Lowes.com
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IRWIN Unibit High-Speed Steel Fractional Self-Starting Step-Drill #5, 10235 - Jobber Drill Bits - Amazon.com
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Irwin - Step Drill Bit: 3/16 to 1/2″ Dia, 1/4″ Shank Dia, Cobalt, 6 Hole Sizes - 82688748 - MSC Industrial Supply
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Irwin 11105ZR Unibit5M 5-Millimeter to 35 -Millimeter by 1/2-Inch Shank Step Drill Bit - Unibit Irwin - Amazon.com
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