Tin-Plated Copper battery cable lugs can be crimped or soldered and have a stackable construction that offers maximum conductivity and flexibility. The gauge is stamped on the lug for quick identification and each lug has flared ends for easy entry. The product has a tin plated copper construction that helps resist corrosion. This 4/0 gauge, 3/8 stud hole, copper lug is a great replacement product for old or damaged battery cable ends.