Manufactured from hardened and heat-treated Chrome Vanadium Steel for strength and durability. Includes internal magnet for retention of spark plug during installation or removal. Extension bar and thin wall design ideal for use in applications with limited access. Universal joint with 360 rotating head, allows for increased access at difficult angles. 12-Point standard depth socket. Knurled design for secure grip. Length 310mm. HEAT TREATED CHROME VANADIUM STEEL Manufactured from heat treated and hardened Chrome Vanadium steel for strength and durability. INTERNAL MAGNET Retains spark plug during installation or removal. EXTENSION BAR 310mm length for increased access. 360 ROTATING HEAD Universal Joint with smooth 360 rotating head allowing access to difficult angles. THIN WALL DESIGN Ideal for use in applications with limited applications. KNURLED DESIGN For secure grip. 12 POINT STANDARD DEPTH SOCKET 16mm 3/8Sq Drive spark plug socket.