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
Pair of Plastic Drill Stops - Lee Valley Tools
Drill Bit Depth Stop Collar Set of 12 Pieces. - Etsy Canada
Drixet Drill Stop Bit Collar Set – Kit Includes: 1/8", 3/16”, 1/4”, 5/16”, 3/8”, 7/16” and 1/2-Inch with Allen Wrench to Tighten The Stops Set-Screws (7-Piece) : Amazon.ca: Tools & Home Improvement
Drill Bit Positioner Woodworking Drill Locator Drill Bit Depth Stop Collars Spacing Ring Locator Drill Bit Locator With Hex Wrench Drill Bit Locator Depth Stop Collars Ring | Walmart Canada