Bought this kit to teach my son how to plug a tire and then he could keep it in his car.It looked complete, and the push in plugs were interesting.We tried the simple push in plugs first. It is a ring nail with a conical rubber sleeve. It went half way in, no further. Then we had a ring nail protruding from the puncture that was in itself hard to remove.We then tried to ream the hole with the screw reamer. Could not insert, so we attempted to loosen the set screw and use the crosshatched reamer. The set screw flats stripped out with the supplied hex wrench and we could not change the reamer. I went over to my tool box and loosened the set screw with a quality hex wrench, changed reamers and proceeded.On inserting the plug, one side cracked off the insertion needle tool. Same issues with the set screw changing the needle.On the other hand, the plug seal seal the hole.If you buy this kit, you will need to add a quality reamer and plug needle. A small set of vise grips also aids removing nails, screws and whatever made the puncture. I would not recommend this kit though.