This is a set of ten stainless steel bolts, lock washers and flat washers to replace the studs that rust and break on the Ford 6.8 liter V10 engine. These engines are notorious for needing the exhaust manifolds and hardware replaced. Why use steel hardware that is just going to rust again? It is always a good idea to use anti-seize on an application like this, it can be found in any good auto parts store.