Here is a quick design I just thought up which could act as a self defense keychain tool while still being quite innocent looking. I made a quick sketch in MS Paint, so please pardon the quality, but I was wondering if people thought this would be a viable SD keychain. To use it, you simply insert your fingers through the holes in the letters, with your smallest finger resting against the bottom of the "L". This keychain can be used as a simple impact tool by punching in a natural manner, or it can be used as a piercing tool by using a hammerfist and striking downwards with the tip of the "L" that should hopefully be protruding from the bottom of your fist if the dimensions of the keychain are correct for your hand size. In my opinion, the key chain should be purposely made to look stupid. Some bright green paint, maybe with some tacky looking glitter, as if it was bought at a low budget tourist destination, would be ideal.