I was nervous about how to attach them to my car, I didn't realize until I saw them in person that a) they come with their key rings and zip ties and b) the black part that protects the blade , slips. So you tie them to keys, rear-view mirrors, child seat backrests, etc. with a key ring or zipper and simply tighten them if necessary. Feel quality and tested the puncher on cardboard. I feel better when I have a pair in my car and one on my keychain.