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For use with Knukonceptz Kolossus 4/0 through 1/0 Gauge power and ground cable. The Sslug40 is made from 6061-t6 aerospace grade aluminum that has been tin plated. is corrosion resistant, coupled with the plated, these gigantic lugs are lightweight and durable. A 3/8″ Allen wrench is required to this product. in the Usa!