3/0 awg tinned copper lugs are made from 99.9% pure annealed tinned copper, providing a high degree of conductivity for maximum current flow. This particular variant is generally suitable for use with 3/0 or 000 Gauge Battery Cable & 1/2" (M12) Stud.
https://selterm.com/collection....s/3-0-awg-tinned-cop
