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POWERTEC 1/8, 3/16, 1/4, 5/16, 3/8, 7/16, 1/2 in. Steel Drill Bit Stop Collar with Split Ring Design and Size Markings (Set of 7) 71491 - The Home Depot
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POWERTEC Steel Drill Bit Stop Collar w/Split Ring Design and Size Markings 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 10mm, 12mm (7-Piece Set) 71492 - The Home Depot
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