Offered in 3 styles, HellermannTyton's RJ11FC3 Category 3 modular Keystone Jacks are designed to give the maximum performance in Category 3 applications. Adapters are available to enable the Keystone Jacks to be assembled with the GigaBand/Alpha Snap shuttered outlet and 6C Angled module. The Category 3 keystone jacks are designed to support any data or voice protocol that is capable of running over a Category 3 cabling system.