WNI cable lugs are manufactured from 99.99% pure copper. WNI’s cable lug + heat shrink tubing kit is perfect for any application requiring a rugged, high amperage electrical connection. Perfect for making battery/inverter cables, welding cable extensions, wiring trolling motors and general marine wiring, wiring battery systems in RV’s/ATV’s/golf carts, and battery banks for off-grid solar & wind systems.