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Amazon.com: toolant Four Sprial Flute Step Drill Bit, 1/4"-3/4" Impact Ready Titanium Coated Unibit Step Bit, 1/4" Hex Shank Unibit for Metal, Stainless Steel, Aluminum, Wood, Plastic : 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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Amazon.com: SAMXY HSS Step Drill Bits 3 Piece Titanium Coated Spiral Grooved Step Drill Bit 1/4" Hex Shank Drill bit for Plastic, Wood, Metal Multi-Hole Taper Drill bit Set for DIY Lovers
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