The bolt punctured the tire head first and put a pretty big hole in it. It also hit just in the perfect spot to miss the tread. I couldn't tell for sure what the culprit was until the guy at the shop changed the tire and pulled that bolt out of it (from the inside of the tire).Dang, that bolt is bigger than the office chair turn-knob that got lodged in my tire in June. After a 3 tire repair places refused to work on it and wanted me to buy new tires, I found a mom & pop repair shop to plug it. Because the tire tech thought it was close to the shoulder, he couldn't vouch that a plug would work, and so he didn't charge me. He just wished me luck getting to a tire shop. I drove on that free, plugged tire until early December and about 10,000 miles.
I understand a lot of tire shops do not want to plug tires for $10-$20, when they can sell a tire for 10x that price.
Yes, I have a plug kit in my trunk now. Plenty out there for under $20 and Wally World has one for $5.88. In my town, with all the construction, it is a wise investment.
So, I got a pretty good looking used tire and service for $60, all included. The good thing about this is I found a decent used tire shop. South Side Tire Services in Austin, if anybody wants to know. Good folks.