PMXCHR200 8MM CYLINDER HEAD REPAIR KIT LETS TECHS MAKE A QUICK, LEAK-FREE REPAIR ON FORD, DODGE & GM. ProMAXX Toolâ??s new Cylinder Head Repair Kit, which includes the new Blind ProSert, allows technicians to rescue a botched repair where an attempt to drill out a broken exhaust manifold bolt has penetrated the cylinder head. After fully extracting the damaged bolt using a ProMAXX Tool ProPlate jig, a technician employs a machine-shop-grade tooling tap to prepare the hole. Then, the Blind ProSert, with a light coat of liquid thread lock, is inserted into the hole, completing a repair that will remain leak free. Drilling freehand or, with an inferior tool, increases the risk of damaging the head. If a tech drilled off center, into the threads, or through the cylinder head, their only choice used to be to remove and replace the entire head. This could take up to 15 hours or more. Now, thanks to the Cylinder Head Repair Kit's gold tooling bits, ProTap and Blind ProSerts, techs will make a stronger-than-factoryepair in about 15 minutes. The Blind ProSert fits into any 8-mm bolt hole, used by most automotive manufacturers, including Ford, BMW, GM, Mercedes-Benz, CDJR, Audi, and many others. The Blind ProSerts are superior quality, hardened steel and black-oxide-coated for corrosion resistance. They are available individually, in packs of three and six. Repair times may vary based on the severity of damage to the head. The kit comes complete packaged in a convenient case with a precision drill bit, tap, locking fluid, ProSerts, and insert tool, all made right here in the United States of America.