Copper Mechanical Lugs. Provide maximum mechanical strength and minimum resistance. All-copper alloy construction features a compact design that is reusable. Accept a wide range of solid and stranded conductors from 14 AWG – 0 AWG. For 3⁄8-Inch stud. Copper Mechanical Lugs. Provide maximum mechanical strength and minimum resistance. All-copper alloy construction features a compact design that is reusable. Accept a wide range of solid and stranded conductors from 14 AWG – 0 AWG. For 3⁄8-Inch stud.