Don't let a fouled spark plug ruin your ride—always be prepared with the Tusk Spark Plug Holder. The updated design accommodates most types and sizes of 2-stroke and 4-stroke motorcycle, ATV, and UTV spark plugs, fitting plugs up to 13/16" (21mm) HEX size. Its secure screw cap construction keeps your spare spark plug secure yet easily accessible, while the durable holder protects against hits, drops, and vibrations. The included foam inserts help keep your spark plug snug and secure, giving you peace of mind on every ride. Small, compact, and easy to store in your trail pack, backpack, toolbox, or on your machine, this holder ensures you're never caught off guard on the trail.