A canister w/keyring that is heavy duty genuine alloy chrome plated solid stainless steel, and unscrews to find a plex-glass vial w/stainless steel lid that also screws on. This item is water proof with double closer and black rubber seal. Store your dosage of pills in it while you go boating/fishing/hiking/sports, put on your keychain or in your pocket for heart medicines, ID, notes, or even great for the fix-it guy that uses little screws and such things all the time, to store and keep pieces handy in it. 53mm (2inches) in total length w/ring. Also is great to hold medicine pills, or such. Use your creativity to put this to an use. Attach with your keys, as you go.