Very clever drill guide system for drilling out broken studs. Use an adjacent stud to secure the tool, then slide the collars over the broken stud and tighten the collars over the stud center. Starting at 1/16th" drill and ending at 5/32" drill, drill out broken stud center, allowing for correct use of the extractor of your choice. Who thinks of this stuff?? I've used these before for drilling fresh holes in precise locations. Check out the youtube videos. This set is brand new, never used.
