keyring-holder for RFID-chips

This is a holder for those (quite standard) 32mm RFID-chips. We use these chips with our entrance-system, but the ones we have tend to brake quite easily when you wear them at your keychain. Instead of throwing the broken ones away and buying new ones I made this little helper. It's a quite tight fit, so the chip doesn't fall off. And my collegues seem to like it. Hope, you do to. And off course you can use it for any other chip or coin that fits in, too ;^)