Photo 1 of POWERTEC Drill Bit Stop Collar Set, 7 Piece Set Adjustable Drill Bit Depth Stopper with Allen Wrench, Bits Stop with Imperial System Size Markings - 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2” (71491)

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Photo 1 of POWERTEC Drill Bit Stop Collar Set, 7 Piece Set Adjustable Drill Bit Depth Stopper with Allen Wrench, Bits Stop with Imperial System Size Markings - 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2” (71491)Photo 2 of POWERTEC Drill Bit Stop Collar Set, 7 Piece Set Adjustable Drill Bit Depth Stopper with Allen Wrench, Bits Stop with Imperial System Size Markings - 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2” (71491)