These peg hook security locks will work on most scan wires up to 1/4 inch (D) with approximately 1 inch frontwire spacing. This device can be relocked without a key. These peg hook security locks have a simple swing aside, no fumble design that allows easy access to the products and can leave all but one item available at a time which will prevent sweeping and mass theft. This ScanLock™ key system comes with optional plates for added protection and will work with metal or plastic backplates. These peg hook security locks are a must have for added protection in high risk environments to protect against merchandise loss.