1 Port Aluminum Lug for 300 MCM - 6 AWG: Aluminum Dual Rated Single Lugs with a 5/16" bolt size are versatile and the reuseable set screw connectors are made of 6061T-6 aluminum alloy. Electro-tin plated for low contact resistance. Suitable for use with both copper and aluminum conductors. Temperature Rating 90 degrees C. Rated 600 volts (2000V max. per UL486B). UL 486A/B Listed. .