Many rivets installed. It's garbage. I bought 20 packs. I opened the 1st package, the first three rivets left the hairpin. I opened the next package and thought the first one was defective, out of 10 rivets, 6 remained on the bobby pin and wouldn't pull out clean. Changed rivet guns three times. Went to the hardware store to buy an Arrow rivet gun, same problem. I missed the return window for the 16 or so unopened packages I have. they are garbage. Don't buy them. Money down the drain and had…