EDCF Key Holder
"The EDCF Keychain Spider is a top quality tempered steel keychain holding device designed to allow you to quickly and easily add and remove items from your keychain. There is a button on the back that moves a gate which allows the pins to be added and removed. There are several types of these on the market, but these are the best quality ones available. Most others are aluminum or pot metal.
If there are tools on your keychain that work best separated from the keys such as an Atwood tool or a keychain pen it can be removed easily then securely reattached. It is even easy to remove items from this device while your keys are in the ignition. You can also remove the key from the keyhold to take weight off of the ignition switch.
Most people who have bought one of these have come back to buy a second one. The reason is these are people that from time to time change the items on their keychain. They use one for storage of items and change them out from to and from their EDC keyholder as their needs change.