The Nite Ize DoohicKey is a handy, lightweight tool that you can use for everything from attaching nuts to opening a bottle with your favorite drink. The DoohicKey is as large as a key and has 6 different options. The tool is equipped with a carabiner that you can attach to your bunch of keys, for example. On the other side of the carabiner opening you have a ruler. There is a wrench under the carabiner. In addition, the tool is equipped with a bottle opener and the flat-head screwdriver. The side of the screwdriver is sharp, allowing you to cut into soft materials.