High Quality Metal MaterialThis 14mm spark plug wrench is a 3/8-inch square drive socket and is made of durable metal material, the product is sturdy and durable inside. HIGH VISIBILITY: High visibility markings ensure you can identify these special sockets in your tool box. This custom socket makes it easier to remove your vehicle's spark plugs. If you need spark plug caps, this is the perfect choice Leaf Spring Bracket Design: Features a unique leaf spring bracket system that holds the spark plug securely in the socket. Won't slip like a magnet clamping system and won't clamp too tight like an O-ring system. 12-Point Socket EndThe 12-point socket end also clamps the flat side of the fastener head, has no corners to prevent rounding, and can be connected with a ratchet wrench, which is convenient and practical. The practical tools you need. CompatibilityNew high-quality spark plug socket wrench, suitable for BMW, Nissan, Mercedes-Benz, etc. Dimensions: total length 63 mm, sleeve 14 mm, thickness 1.5 mm, square edge diameter 10 mm.