This 12mm thread spark plug socket with 18mm hexagon size is the most commonly used size for spark plugs in passenger cars, light commercial vehicles, and many garden machinery engines. The 3/8" square drive provides versatile compatibility with your existing socket sets and torque wrenches. The 6-point deep socket configuration ensures maximum contact with the spark plug hexagon, reducing the risk of rounding whilst the protective rubber insert securely grips the 12mm threaded plug and prevents damage to the ceramic during removal and installation. Constructed from hardened and tempered chrome vanadium steel with a micro satin chrome finish, this socket delivers professional reliability. The 65mm length reaches into deeper plug wells, and the knurled ring provides confident grip control even when your hands or the socket become contaminated with oil or dirt. Features and Benefits: • 12mm thread size with 18mm hexagon for standard automotive applications • Rubber insert for plug protection and secure retention • Chrome vanadium steel hardened, tempered and micro satin chrome plated • 65mm length for accessing recessed spark plug wells • Knurled ring for superior grip in all conditions Contents: • 1 x 12mm Thread 6 Point Satin Chrome Spark Plug Socket, 3/8" Sq. Dr., 18mm