Milwaukee's range of 6-point Spark Plug Sockets has been designed from the ground up to be part of the most versatile spark plug socket family. The chrome spark plug sockets are made with knurling to give you extra precise control and grip in specific applications. They also have their sizes stamped onto the socket, giving you improved and easy-to-read visibility. Coming in both magnetic and non-magnetic, each has rubber retainers to keep a secure grip on bolts and fasteners. Milwaukee back all our spark plug sockets with a limited lifetime