Blue twist on wire connectors have a blue thermoplastic shell with ridges for easy twisting of the connector. For wire sizes 22 awg to 16 awg wire. The inner spring of the twist wire connector grabs the exposed copper conductors of your wires and threads itself on to provide a secure and reliable electrical connection. Connector can easily be removed if necessary. Multiple wires can be connected together in a single twist on connector. Twist the exposed ends of your wires together in a clockwise direction, then twist your blue connector onto the ends of your wires. The more you twist, the tighter the connection gets.