3 Port Aluminum Dual Rated Transformer Lug 350 MCM - 6 AWG with 4 Mounting Holes Aluminum Dual Rated Transformer Lugs are versatile and reuseable set screw connectors made of 6061T-6 aluminum alloy for superior electrical and mechanical performance. Two set screws per wire hole ensure an exceptional connection. Electro-tin plated for low resistance. For use with copper or aluminum conductors. Mounting hole spacing is NEMA 1-3/4". Meets or exceeds ANSI C119.4 Class A. Rated 600 Volts. Temperature Rating 90 degrees C.