Believe it or not, this tire plugging tool can be really useful. Sooner or later you'll have a tire with a slow leak, and upon examination, you'll find a nail or something in it. You just remove the nail, use a phillips screwdriver or something similar to poke through the hole to be sure it is fully opened all the way through. Then insert one plug through the hole at the tip of the tool
(the plug is sort of like a 6" piece of small diameter rope which has been coated with a tar-like substance), and dip the plug on the tip of the tool into some rubber cement. Now shove the tip of the tool with the plug into the hole all the way, pulling the plug all the way into the inside of the tire. Next pull the tool back out part way, until the metal tip clears the hole so you can cut off the ends of the plug, leaving two strands of the plug now lodged in the hole. Cut it off flush with the tread with side-cutters, re-inflate the tire, and you're finished. It is a permanent repair, unless the tire has been severely damaged, or had ply separation, etc.
(Keep in mind that you should never plug a tire if the hole is in the sidewall. Such tires are ruined, and must be discarded, or be used with an inner tube.)
I can assure you that this is exactly how most tire stores have done it for decades, and if you do it right, it is a great repair. And the first time you find yourself with a leak and no time to go to a tire store anywhere, you will LOVE having that tool in your box.
