The socket can be used with a reversible ratchet (3/8") or a combination wrench (17 mm). Thanks to its extra thin-walled design, spark plugs can be installed even in narrow spark plug shafts. The spark plug is held during installation by a rubber insert inside the wrench. Material: hardened steel Number of points 12 Item type Spark plug socket Outer diameter 18.5 mm Application Spark plug wrench Main colour black Length 50.0 mm Wrench size 14 mm