Lay In Connector 250 MCM - 6 AWG Lay-in connectors offer the ultimate in flexibility. Excellent for grounding and continuous loop applications. Made of 6061T-6 aluminum alloy. Electro-tin plated for low contact resistance. Suitable for use with both copper and aluminum conductors. Rated 600V (2000V max. per UL486B). UL 486A/B Listed. Temperature rating 90 degrees C.