A drill stop is a device that you use mostly on a hand held drill to keep the drill from drilling deeper than a certain amount. I've had a few different ones. Ones that had a collar with a screw that tightened against the drill bit flute. They didn't hold very good and the screw were too small to make good contact, especially on small bits. I had others that stripped out the threads. Then I had some aluminum ones that were split and clamped the bit but these stripped out after a few uses or the aluminum galled from the steel Allen screw. Finally I found these at Home Depot, they're steel, they have a steel Allen headed screw and they fit my Bosch and Milwaukee bits perfectly. They hold and tighten just fine. They cost me $19.26 shipped to my door. I've no idea if anybody has a need for them but I haven't found these steel ones anywhere else. https://www.homedepot.com/p/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-7-71491/313566720
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