Stahlwille STW460618 Spark Plug Socket Rubber 3/8in Drive 18mm Stahlwille Extra Deep Spark Plug Socket with 3/8in Drive and rubber insert. Made from HPQ high-performance quality steel and chrome plated. They have an extremely high load capacity with exceptionally thin rings and walls. Equipped with anti-slip drive to permit high transmission of forces to the lands of the nuts and bolts without damaging them. Made in Germany. Stahlwille Spark Plug Socket Rubber. Size: 18mm (11/16 in).