1. Lambda Sensor Wrench Nuts Set: The package includes 5 oxygen sensor tools: 1 oxygen sensor socket wrench (1/2' drive x 7/8' (22mm) x 50mm); 1 vacuum switch socket (3/8' drive x 7/8' (22mm) x 30mm); 1 vacuum switch insert (3/8' x 7/8' (22mm) x 30mm); 1 vacuum switch insert (3/8' x 7/8' (22mm) x 90mm); 2 thread cutters (1 M12 x 1.25mm, 1 M18 x 1.5mm). 2. Quality Material: The lambda sensor wrench nuts set is made of CRV chrome molybdenum steel, offering hardness, wear resistance, impact resistance, corrosion and rust resistance. It is durable, resistant to deformation and breakage, ensuring a long service life. 3. Smart Design: The specialized side cutouts of the lambda sensor tool provide easy access to the oxygen sensor from any angle while protecting the cable from damage. The square drive opening on the side tab allows for turning with a ratchet or other suitable tool. 4. Thread and Professional Disassembly: The lambda sensor tool effectively cleans old threads, straightens damaged sections, removes rust, and ensures secure spark plug installation, reducing the risk of failures. It precisely fits oxygen sensors and other components, minimizing damage risks and revitalizing your car engine.