Keychain clip for your EWC knife.  Get a clip for each of your keysets, bags, and whatever else you like to carry your EWC on.  Switch between each of the clips in seconds by sliding in until it clicks.  A positive lock keeps it in place until the the latch release button is pressed.  Made of strong stainless steel, it can survive the abuse it will see in daily use.  The hook can also be used to open your favorite bottles.