Milwaukee 3/8" Drive 9/16" Spark Plug Socket is designed for durability and precision. It features a dual-material rubber retainer that ensures a secure fit within the socket while holding spark plugs firmly to prevent dropping or damage. The socket is equipped with precision knurling on the outside, providing better control when hand tightening or loosening spark plugs. Both the socket and retainer resist harsh chemicals commonly found in garages, enhancing longevity. Size markings are clearly stamped for easy identification, and the external hex at the base fits an 11/16” wrench for added control. This spark plug socket is backed by a Lifetime , making it a reliable tool for any mechanic or DIY enthusiast. Model Number: 48-22-9550