Features and Benefits:Allows you to move bolt hole to bolt hols without moving base plate;Removes Broken Exhaust Manifold Bolts OnDodge® 4.7L Motors Without Damaging theCylinder Head.Tapered bolts center base plate over bolt holes and slip fitbushing allows you to move from hole to hole without movingbase plate. The screw extractor is then used to removethe broken bolt. Includes bushing to drill to tap size whenextractor cannot be used.