Delivery contents - 1 x 14mm thin-walled universal joint spark plug connector + 1 x 16mm thin-walled universal joint spark plug connector. High quality - Hardened and heat treated carbon steel. Designed and designed to remove and install the spark plug. The inner magnet does not wear out over time like conventional rubber seals and provides a long service life. High flexibility: The spark plug socket set The ignition has a 360 degree swivel feature for maximum flexibility and allows access to the tightest areas. UNIQUE DESIGN: Magnetic and thin-walled design that ensures a perfect fit when installing and removing, so you don't have to worry about losing one. Widely used - Magnetic spark plug housing compatible with BMW, BMW mini such as BMW N54, N55, N63, Benz E90, etc. Specification: Material: carbon steel Size: 16mm 14mm Color: silver Packing lists: 1 * 14mm thin wall spark plug socket mm 1 * 16mm thin wall spark plug socket Suggestions: Please allow for 0-1cm errors due to manual measurement