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Amazon.com: Klein Tools KTSB15 Step Drill Bit #15 Double Fluted 7/8 to 1-3/8-Inch with Easy-to-Read Step Markings and Targets, 3/8-Inch Hex Shank : Industrial & Scientific
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DEWALT 14-Piece Assorted Black and Gold Coated HSS Jobber Length Twist Drill Bit Set in the Twist Drill Bits department at Lowes.com
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MAXIMUM Impact Cobalt Step Drill & Drill Bit Set for Wood, Metal, Plastic, Masonry, 10-pc | Canadian Tire
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Amazon.com: NEIKO 10197A Step Drill Bit Set, 5 Pc Step Bit for Metal, 50 SAE Sizes Total, 1/8” – 1-3/8”, SAE Titanium High Speed Steel Unibit, Stepper Cone Drill Bit, Two Flute
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