This little guy can fit just about anywhere and contains a 3/32 hex key for uninstalling/reinstalling the safety screw on your laser aiming device. It’s the same size as a 123A battery, so it fits in all the usual places (e.g. stock/grip storage, NOD-Pod, etc.), and it can also be used as a zipper pull or threaded on paracord or shock cord. Translation: you won’t even know it’s there until you need it!