I work in construction and it's easy to accidentally damage a tire with a carelessly thrown nail or screw. The good news is that an air compressor is usually on site. So if you have an air chuck and piercing kit, this is an easy fix. I've had several of those cheap puncture plug kits that you buy at your local auto store. With thick, sticky threads and flimsy installation tools that don't seem to work. I wanted a better tool and maybe even a better system. After watching a few videos I settled on the Dynaplug Pro kit with additional installation tips that you can preload with plugs along with a nice storage bag to keep everything together. I didn't go for the compact air pump or the CO2 filling options. The "good thing" is that the instrument is of good quality. Pen storage is great for keeping a variety of bits close at hand. The large flat top has just enough room to put your foot or pegs in the hoop and they work just like they do in the video. Insert the tool, pull it out again and the plug stays in the tire. Their videos recommend testing the repair with a small amount of water to check for bubbles and adding additional plugs to the same repair if needed. Install three plugs that are still leaking. Four, then five, still flowing. It seemed that each plug just crushed the one already installed, so the leak was in a slightly different spot each time. I even had a leak between two previously installed plugs. I ended up putting in the dynaplugs and using my old cheap kit with thick sticky cords to plug the hole. It worked, although using these tools was always a problem. Five stars for the quality of the set, ease of use, well thought-out system. I'm deducting a star because this only works well if your piercing is fairly small, which is usually the case. I'm not going to abandon my cheap kit though and just grab this one because it failed me and I don't want to lug around two, so. Another very small point of criticism: In order to change the tips on the tool, you have to completely remove the screw ring. A quick change design would be handy and I don't think it would be too difficult to design, especially as the manufacturer suggests you may need to put two or three plugs in one hole. That means a lot of screwing and unscrewing the collar and plenty of opportunities to drop the tip or collar in the mud or snow in the process.