Removing a broken stud can be a tricky, time consuming undertaking. Pro's know boring a well centered hole is key to using extractors effectively. OTC now offers a solution to assist you with drilling a perfectly centered hole! The 6982DGS from OTC allows you to anchor off a good stud to perfectly center a drilling alignment guide over a broken one. Place the slot of the rail guide over any good hole with appropriate size bushing and loosely secure with good stud. Slide/pivot opening in rail guide over broken stud and insert alignment guide for drilling. Tighten stud to hold alignment and begin drilling. The OTC 6982DGS comes with 4 alignment guides for "progressive drilling". To cover most applications we also provide 4 bushings in 6mm, 8mm, 10mm, 12mm, sizes. The OTC 6982DGS is another great quality tool you'll want in your tool box..