IDEAL® Wing-Nut® General Purpose Winged Twist-On Wire Connector, Series: 454, 14 to 6 AWG Wire, 600 VAC, 105 deg C, Thermoplastic Polyester Shell, Blue, 1.45 in H x 1.2 in W x 0.78 in Dia, Box of 25
Wing-Nut® wire connectors have a square-wing spring that threads direction onto conductors for fast and secure connections.