General description Neilsen 3/8" 14mm Swivel Extra Long Spark Plug Deep Square Metric Socket is designed for easy access to spark plugs in tight spaces. This socket features a knurled surface for a secure grip and a thin wall design with an internal magnet to hold spark plugs securely. Technical specifications Drive Size: 3/8" Socket Size: 14mm Length: 310mm Type: 12-Point Other information Includes a universal joint for enhanced maneuverability.