What kind of keychain weapons do you have?
Also, I have seen these little metal bar things that some martial arts people use that they have on keychains, does anyone know what this is? It's like a small round piece of metal basically.
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Sounds like you are asking about a kubiton.
I don't carry anything on my keyring except for keys and a fob.
There are a few options. Pepper spray is available in many key chain models. So are some knives, kubotans as mentioned above, saps.. etc.
Everybody needs one.....