LONG LASTING DESIGN: Hex head design allows for automatic or manual installation without stress distortion and square wire spring grabs and holds wires for secure connections LONG LASTING DESIGN: Streamlined design for compact installations and long skirt covers stripped wires TEMPERATURE RATING: 600V max in building wire and at 1000V max in lighting, fixtures/luminaries and signs COPPER TO COPPER connections only WIRE RANGE: 3 #22 (min) and 3 #10 (max) UL LISTED: Canadian and U.S. requirements (connections rated at 600V Max for building wiring and rated at 1000V Max in lighting fixtures/luminaries and signs) WIRE RANGE: 3 #22 (Min) to 3 #10 (Max)