Spark plugs are unique. Having the right size socket for your vehicle’s plugs is a must. You need a strong tool to release stubborn stuck plugs yet a soft touch so you don’t do any damage. The Powerbuilt 2 Piece Magnetic Spark Plug Socket Set includes two of the most common sizes 3/8 Inch Drive 5/8 Inch and 13/16 Inch Spark Plug Sockets. These sockets are strong as well as protective of the spark plugs. The premium Chrome Vanadium steel sockets have a mirror polished chrome finish for durability yet have an innovative rubber insert to protect the spark plugs and center hole punched for added work depth. The sleek chrome finish is enhanced with an easy-to-read size marking that is forged into the metal socket. Precision chamfered Z-Drive 6-point hex faces easily guide the sockets onto fasteners and allow for a more solid grip on the flat surfaces to prevent damage or rounding. An external hex bolster allows for additional turning options. Powerbuilt sockets exceed ANSI standards.