About The Drill Stop Bit Collar Set The Problem: When drilling with force you finish up over drilling but you can't decrease force either, how can you use force without over drilling? Our Solution: The Drill Stop Bit Collar Kit that fits on most bits and sets easily to the exact depth needed, while preventing from over/under drilling, so you are left instantly with Depth-Precise equal length holes. Setscrew: Drill Stops have a built-in screw to help adjust the size and amount of pressure that is used to tighten the stop on the bit without damaging it. Wrench: The Wrench will help to adjust and install/uninstall the stop bits and can also be used for any other project.