The 18mm variant of this Draper 3/8" Drive Deep Bi Hexagon Spark Plug Socket is designed for larger spark plug applications, commonly found in higher-capacity engines and certain specialist vehicles. With its 250mm extended length, this deep socket provides the crucial extra reach needed to access spark plugs positioned deep within modern engine bays, particularly on models from manufacturers including Citroën, Peugeot, Renault, BMW and Mini. Manufactured from premium chrome vanadium steel and subjected to rigorous forging, hardening and tempering processes before receiving a protective chrome plated finish, this socket is engineered for professional durability. The 12-point bi-hexagon configuration ensures optimal contact with spark plugs, minimising the risk of rounding, whilst the magnetic end securely retains plugs during removal and installation, preventing costly drops into inaccessible engine spaces. Features and Benefits:18mm socket size for larger spark plug applications