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ASSORTS's Drill Stopper Collar Set In Imperial & Metric with Allen Wrench to Tighten the Stops Set-Screws (7-Piece) (METRIC SIZE SET) - Walmart.com
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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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