Hubbell Premise Wiring keystone jacks are extremely useful in data communication, for mounting low-voltage electrical jacks & optical connectors into wall plates, network racks and shielded patch panels & cords. They are ideal for USB patch cords, RCA jacks, UTP cables and Category 5e ethernet cables. These connectors provide a point of data transfer for output and input ports. Snap-fit inline keystone couplers fit over another connector securely, while RCA gold pass-through connectors are used with AV jacks to provide a point of external connection & accept a female connector. Choose from a wide range of these AV connectors, available in coupler, USB 2.0 B female and 110 punch-down termination types. Raptor Supplies also offers snap-fit stereo jacks for 3.5 mm jacks.