I like that this fits on my keychain and it looks like a key - it's not a tool that I would use around the house because it's not the easiest to hold but on the go it's a great idea. I've already needed to use the screwdriver and the knife part is handy to use for opening packages. I'm assuming you can also use this for protection - they say to hold your keys as a weapon and if needed, these would be THE keys to use!