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Aluminum Mechanical Lugs Four Conductors Dual Set Screws Mount 600mcm-#4 Awg 4 Connectors provide for Flexibility in Installation.aluminum 4 4 features include: 4 Mounting in Pad allow for 4 Bolts when these 4 4 is manufactured from high strength 6061-t6 Alloy to insure both maximum and conductivity Al9cu Rated for Copper and Electro-tin Plated to contact resistance and protection against corrosion Assembly can be made with only a screwdriver or allen wrench and they are re-usable Nema Standard Drilling 1-3/4 Centers is 600v 194f (90c) Ul486b/csa Listeddimension Measurements = Inches Order Qty of 1 = 1 Piece Below is more info on