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Centek Centralizer | Stop Collars
Hinged and Slip-on Stop Collars – Accord with API 10D Standard
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
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