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Amazon.com: Aluminum Stop Collar Set - Drill Bit Depth Stop - Superior Split Ring Design - 8 Piece Set (1/2", 7/16”, 3/8”, 5/16”, ¼”, 7/32”, 3/16”, 1/8”) - Drill Bit Holder : Tools & Home Improvement
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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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Ruitool Drill Depth Stop for Drill Bits,Adjustable Drill Stop Applicable Drill Size Range 5/64"-3/16",15/64"-7/16",Aluminum Drill Bit Stop Collar Set for Woodworking Tools & Hand Tools,2 Pcs - Amazon.com
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Drilling Limit Ring, Drill Bit Depth Stop Collar, Lightweight 12pcs Stainless Steel for High Carbon Steel Drills Drilling Limit - Amazon.com
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