14Mm & 16Mm (9/16″ & 5/8″) Magnetic Swivel Spark Plug Socket. 1 Piece 14mm Magnetic Thin Wall Swivel Spark Plug Socket. Socket Sizes: 14mm & 16mm (9/16″ & 5/8″). Enhance your automotive toolbox with our high-quality magnetic swivel spark plug socket designed for maximum efficiency and ease of use.