Milwaukee 3/8" Drive 5/8" Spark Plug Socket features a durable dual-material rubber retainer designed to maintain a more secure fit within the socket while securely holding onto spark plugs to avoid dropping or damaging. It includes precision knurling on the outside of the socket for better control when hand tightening or loosening. Both the socket and retainer are resistant to harsh chemicals commonly found in the garage. Stamped size markings make it easy to identify the socket size, and the external hex at the base fits an 11/16” wrench for added control. This spark plug socket is backed with a Lifetime , ensuring long-lasting performance and reliability. Model Number: 48-22-9551