This CAT6 RJ45 Keystone Jack is a snap-in module with tabs. They are used for mounting low-voltage electrical jacks or optical connectors into a keystone wall plate, face plate, surface mount box, or a patch panel with a CAT6 shielded computer networking cable. All keystones are interchangeable and replaceable. This jack is a ""pass through""connector where there is a jack on the front as well as the rear for patch cords to connect to both sides. - Conforms to EIA/TIA T568B standards, Size: 14.5 mm wide by 16.0 mm high