Cylinder head and exhaust head bolts are used for easy removal of metal parts exposed to high temperatures. The bolts can also be used on gears, sprockets, and rollers. The bolts have been designed to resist corrosion due to the presence of carbon monoxide (CO) in them. The bolts are made from a special blend of aluminum, copper, and graphite. The bolts are heat-resistant and non-corrosive. They are available in black or white.