Review on Collars Woodworking Positioner Locator Wrench by Paul Sanchez

I had to drill a hole in the car but didn't want to go too far so I got these stoppers. In the first hole I drilled, it seems I didn't tighten the set screw enough and almost damaged it when it slipped off. The set screw must be tightened enough to break the supplied hex wrench. I have a very good quality set of allen wrenches and used one of these to tighten it because the wrench that came with it was bent too much. I was afraid I would break it. In summary the stops work but I would recommend using a higher quality wrench. And tighten the set screw as tight as you think without loosening it.