Features and Benefits: Forged from high quality, chrome vanadium alloy steelContains socket sizes that easily remove and install the spark plug sizes common to most vehiclesPackaged in a blow mold caseFully guaranteedThis set is to assist in the easy removal of spark plugs This set is to assist in the easy removal of spark plugs. This set contains socket sizes to fit the spark plugs common to most foreign and domestic vehicles. This set is packaged in a blow mold case and is backed by the Sunex Tools lifetime warranty. Forged from chrome vanadium alloy steel and fully polished. WARNING: This product can expose you to Nickel (Metallic) a chemical known to the State of California to cause Cancer. For more information go to www.P65Warnings.ca.gov.