I had it on my Mercury Cougar back in the 90's. The main use for it was so I could lock my keys in the car if I didn't want to bother with taking them with me

I had it on my Mercury Cougar back in the 90's. The main use for it was so I could lock my keys in the car if I didn't want to bother with taking them with me (such as at the beach -- hard to swim with your keys in your pocket).