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Amazon.com: SILATU Step Drill Bit - 1/4” to 1-3/8” Step Drill Bits for Metal, High Speed Steel Black Coated Stepping Bit, Unibit Ten-Flute Step Drill Bit Sizes for Wood, Metal, Plastic, Multiple
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Greenlee GSB12 1-3/8" Step Bit (#12) Metal Cutter with Patented Split-Step Design, 1-3/8" Metal Cutting Tool for 1/2" Drill Chucks: Amazon.com: Industrial & Scientific
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DIABLO 1-3/8 in. x 31 in. x 36 in. Carbide-Tipped Rebar Demon SDS-Max 4-Cutter Hammer Bit DMAMX1350 - The Home Depot
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Irwin Tools Unibit #5 1/4-Inch to 1-3/8-Inch Step-Drill Bit, 1/2- by IRWIN 10235 ..#from-by#_partzforce_62231816880624 - Amazon.com
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Drill America 1-3/8-in 6-in Cobalt Silver and Deming Twist Drill Bit in the Twist Drill Bits department at Lowes.com
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