Review on OTC Tools 6982DGS Drilling System by Justin Sharp

OTC Tools 6982DGS Drill Guide System helped create a perfectly centered hole in a broken exhaust manifold bolt. Make sure the hole is centered. Check the hole constantly while drilling, and additionally check the depth of the hole along the studs to make sure the hole does not hit the cylinder block water jacket. Use drilling oil/paste. Avoid overheating the drill bits when drilling metal.