Features: Prevents unauthorized removal of cables, IP phones, and other network equipment, as well as critical connections. Doesn't interfere with adjacent modular jacks or plugs, even in high-density environments. Physically secures plugs when locking them in and allows for safe removal from modular jacks. Can only be inserted or removed with the dedicated tool. Applications: Prevents LAN cables from disconnecting from network equipment, etc. Note: *Cannot be installed on some modular plugs. *Cannot be installed on JIS adapters with shutters. Included: Dedicated tool x 1 Material: Polycarbonate Width (mm): 13.9 Height (mm): 18.7 Depth (mm): 19.6 The above is the manufacturer's description. I am selling this because I no longer use it. There are three keys. Thank you.