Amazon.com: NordWolf M35 Cobalt SAE Step Drill Bit, Spiral Groove Double Flute Multiple Hole Unibit for Stainless Steel & Metal Sheet, 13 Imperial Step Sizes 3/16" to 1-3/8" : Industrial & Scientific
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Cle-Force C69025 1683 1/4 in-E Heavy-Duty Double End Drill - Split 135 Point - 0.7874" Spiral Flute - Right Hand Cut - 2.756" Overall Length - High-Speed Steel - 0.25" Shank - C
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Amazon.com: NordWolf M35 Cobalt SAE Step Drill Bit, Spiral Groove Double Flute Multiple Hole Unibit for Stainless Steel & Metal Sheet, 13 Imperial Step Sizes 3/16" to 1-3/8" : Industrial & Scientific
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Klein Tools Step Drill Bit #14 Double-Fluted, 3/16 to 7/8-Inch KTSB14 - The Home Depot
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