The folks at Coolest Gadgets had this to say about the Survco Tactical Credit Card Ax:
If you only want to pull out your wallet to be able to tighten a loose bolt, cut a bit of twine, cut down a branch, or protect yourself in the wilds, you’ll want the SURVCO Tactical Credit Card. This has 21 capabilities, all on a thin piece of metal that you can slip into your wallet. It can pull up nails, act as an arrow, spear, saw, ax, tomahawk, knife, scraper, skinner, shovel, seat belt cutter, bottle opener, water valve wrench, gas valve wrench, flat head screwdriver, can fit fourth, five-sixteenths, half, three-eighths, and seven-sixteenths inch sockets, and more.
Read the full review here: