S&S Rubber Band Style Cylinder Heads ClampsFeatures and benefits:Replace Your Flimsy and Troublesome Stock Clamps3/4'' Wide and Constructed Of .020'' Thick Stainless Steel and Use A Curved 10-24Threaded ''T''-Bolt With Plated Steel Aircraft Hex LocknutSold Individually—Two Are Required For Each EngineIntake Manifold O-Rings and Rubberbands Are Made Of Special Materials ThatResist Destruction from the Additives In Today’S Fuel