although it looks like an average key chain, it can be useful to stop animals/humans in emergency situation.
it takes seconds to take it from your pocket and arm yourself.
Step 1: How to Make
1. take a - preferably unused - leftover bike chain (at least 9-11 links, ~12 centimeters, ~5 inches).
2. add two key rings to both ends of the chain.
3. optionally you can add one more - sliding - key ring to the chain.
4. add the keys to the two (or three) rings. try finding meaningful groups. for example: home + bike keys, basement keys, car keys.
Step 2: How to Use
hold the end of the chain in your hand and... swing.
hold both ends of the chain and ... use it at your own risk.
This is an entry in the
Pocket Sized Contest