A GOOD FIT FOR MOST VEHICLES: The three sockets of this SAE socket set, 5/8” (16 mm), 9/16”, and 13/16”, are the most common socket sizes needed for spark plugs in older or modern cars; Sockets may even fit the spark plug of some small enginesBE A MAGNETIC MECHANIC: Non-magnetic spark plug sockets can leave the plug holder insert still stuck on the spark plug after installing or keep the spark plug stuck in the socket after removal; Avoid the hassle of wrestling objects from tight spacesDON’T LOSE THE SPARK: During installation, the magnet inside these sockets holds the spark plugs in place, preventing drops; Dropped spark plugs could cause misfires even if they look undamaged; Preventing drops protects your engine and your walletGET IN THERE: This deep socket set has sockets that measure between 2-1/2" and 2-7/8" in length, enabling easy spark plug removal and installation whether or not a ratchet extender is usedQUALITY MATERIAL: These sockets are made with a special heat-treated alloy steel with a Hard Chrome Finish; Deep marking allows for easy identification; This magnetic socket set is rust resistant and oil damage resistant for long life of use The OEMTOOLS 22891 3/8 Drive Magnetic Spark Plug Socket Set includes three sockets that fit most automotive spark plugs: 5/8" (16 mm), 9/16", 13/16". This deep well socket set features a strong magnet in every socket that holds the spark plug in place whether one is removing or installing the plug. Other non-magnetic spark plug socket sets have inserts in the sockets meant to hold the spark plugs in place, but the inserts often come out of the sockets and get stuck around the plug. These stuck inserts can be a pain to get out with greasy or dirty hands, especially if the inserts get stuck repeatedly during a multi-plug replacement. This, however, is not a problem with these magnetic sockets. Each piece in this spark plugs socket magnetic set will hold the spark plug in place without coming apart and creating extra work. The magnetic 6 point socket set prevents spark plugs from dropping during installation and adds extra strength to getting stubborn spark plugs unstuck as a spark plug removal tool. The OEM TOOLS 3/8 socket set is made from an alloy steel that has been heat-treated and that has a Hard Chrome™ Finish. The deep markings on each piece of this spark plug tool set allow for easy identification. The entire magnetic sockets set is rust resistant, oil damage resistant, and unlike other sockets & socket sets, easy to clean. Given the advantages of a deep magnetic socket over a non-magnetic spark plug deep socket, these OEMTOOLS sockets belong in any spark plugs tools set.