IDEAL® Twister® General Purpose Winged Twist-On Wire Connector, Series: 342, 18 to 6 AWG Wire, 600 VAC, 105 deg C, Thermoplastic Polyester Shell, Gray, 1.31 in H x 1 in W x 0.66 in Dia, Box of 50
Twister® wire connectors have a live-action, spring-wire spring that locks onto wire for safe and secure connections.