Designed to Remove Broken Exhaust Manifold Studs on 4.6L, 5.4L 2 Valve, 5.4L 3 Valve and 6.8L V10 Ford Engines without Damage. Interchangeable plates ensure drill is centered on the broken stud. Depth gauge for drilling is marked on the template. The stripped screw extractor is then used to remove the broken stud.