Dual Rated Turn Prevent Lug 300 MCM - 6 AWG Dual Rated Turn Prevent Lugs are made of 6061T-6 aluminum alloy. Electro-tin plated for low contact resistance. For use with both copper and aluminum conductors. Rated 600V (2000V max. per UL486B). UL 486A/B Listed. Temperature Rating 90 degrees C.