Aluminum Dual-Rated Single Lug 3/0-6 AWG with 1/4 Inch bolt size for use with copper or aluminum conductors. These Lugs are versatile and feature reuseable set screw connectors made of 6061T-6 aluminum alloy. Electro-tin plated for low contact resistance. Temperature Rating 90 degrees C. Rated 600 volts (2000V max. per UL486B). UL 486A/B Listed. .