Quick Cable Inverter Hook Up Cable - 4 Gauge Black. Thick copper lug best conductor tin plated for durability and maximum conductivity. 3/8" stud hole in both ends. Features of Quick Cable Inverter Hook Up Cable - 4 Gauge 3/8" stud hole in both ends Heavy wall heat shrink tubing with meltable liner seals out corrosion UL Quick Flex cop per cable for maximum flexibility rated 25 7"F (125C) Thick copper lug best conductor tin plated for durability and maximum conductivity Red = Positive Black = Negative Package Contents: Quick Cable Inverter Hook Up Cable - 4 Gauge Quick Cable 205405: Inverter Hook Up Cable - 4 Gauge Black