The Mac Tools SPK9SET 9-Pc Master Spark Plug Socket Set is a high-quality hand tool set designed for professionals in the automotive industry. Made by the trusted brand Mac Tools, this set includes 9 sockets with a 3/8" drive size, providing versatility and ease of use. The universal flex design allows for flexibility and access to hard-to-reach areas, making it a valuable addition to any toolbox. With top-notch craftsmanship and durability, this spark plug socket set is a reliable choice for mechanics and automotive technicians.