PARTSMART SMR35650 Flared Copper Lug - 4 Gauge - 3/8" Stud (Pack of 25) Lugs are made of 99% pure copper tubing and are flared to allow for easy cable entry. Use to connect large gauge wire and cable to batteries and junctions These lugs can be crimped and/or soldered to the cable For SAE cable 4 gauge and Stud size 3/8". The cable size is stamped on the tongue for easy identification Amperage Rating: 80 Voltage Rating: up to 600. This product is sold as a package of 25.