This oxygen sensor and thread chaser set is an essential tool set for the mechanic and is suitable for most modern vehicles. The sockets are constructed of chrome vanadium and carbon steel for strength and durability with a plating finish to fight off - rust. The oxygen sensor sockets can fit on most modern cars. It\'s ideal for the removal or replacement of oxygen sensors from the exhaust manifolds on many models. And the two chasers are practical for cleaning and repairing damaged threads. All tools come in a molded storage case for easy transportation. Delivery includes 2 oxygen sensor sockets, 2 thread chasers, 1 switch socket and 1 molded plastic storage case.