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. Sold per piece with a 10 piece minimum. 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.