Eyeglasses are not meant to last forever. In fact, their screws come loose after a few months. The E-see-er is designed for those of you who want to prepare for that. You can attach this to your keychain, and you are ready to go. The E-see-er is very small, so you won’t even feel it. E-see-er comes with three sizes of replacement screws. The screwdriver works for both flat head and Phillips screws. Compact and gets the job done.