Meet the Bone Breaker Micro Bottle Opener Keychain: an EDC multitool that can be used for self defense. It is a force multiplier that you can use when in trouble to buy yourself some time. You can easily fit it in your pocket or wear it inside your waistband.
The Bone Breaker Micro has a anodized black aluminum construction. It weighs only 1oz. You can find out more about it here.