Just don't take it on a plane like I did :(

This tool card is a great idea and, having bought one offline, I've found it quite useful. The can opener is not very good but with a bit of filing to give it a wee bevel it's pretty good (I found mine worked well only after I ground off the screwdriver edge on the can opening area). The eyeglass screwdriver is especially handy for those times when your glasses' arms work loose and the screws need tightening. But I really don't think $20 is a fair price to pay, despite its uses, as there are other tool cards out there which are equally handy but cost much less.

This comes in handy especially when your in an awkward place and forgot a screw driver