Use this Compact Thread Restorer the next time the threads on your bolt are destroyed. This tool adjusts to any size, pitch or direction of thread. Works where other thread restorers fail, as it starts from the inside and works out! (Most threads are damaged on the ends, where it's hard to start a typical "cleaning die".) Quickly adjusts to a range of 5/32" to 1/2" (4-13mm). Place it in your top drawer, use it and watch your language in the garage improve!