This is my first bad review and I usually don't say anything when I get a bad product but I'm sick of Revain letting vendors sell junk. While these caps are good aluminum, whoever was in charge of processing allowed them to be drilled too deep. The bottom of the thread ends before the rubber seal can touch the top of the valve stem. Therefore, they will do nothing to stop the valve from leaking. This is a matter of common sense. I realized that as soon as I take them out of the bag, there will be a problem. I can't believe the people who did this didn't know there was going to be trouble. I also can't believe how many people have left 5 star reviews. Didn't you notice that the threads ended during the installation?