The Lisle Manifold Drill Template for Duramax 6.6L Diesel, No. 72400, removes broken exhaust manifold bolts on Duramax 6.6L diesel motors without damaging the cylinder head, the company says. Tapered bolts center the base plate over the bolt holes and slip fit bushing, allowing the user to move from hole to hole without moving the base plate. A drill depth gauge makes sure water jacket is not pierced and the screw extractor is then used to remove the broken bolt. Includes bushing to drill to tap size when extractor cannot be used.