4 AWG 5/16 inches Nylon Ring Terminal 25-Pack. Ancor's Marine Grade terminals differ from automotive terminals by being designed for the harsh marine environment. Nylon insulators are easy to crimp and will not split. Barrels are designed to tightly grip the wire with the least effort. Tinned copper gives the least electrical resistance but the most corrosion protection. Features Nylon insulated with insulation grip. Double crimp, funnel entry. UL 486C. 4 AWG 5/16 inches Nylon Ring Terminal 25-Pack. Ancor's Marine Grade terminals differ from automo tive terminals by being designed for the harsh marine environment. Nylon insulators are easy to crim p and will not split. Barrels are designed to tightly grip the wire with the least effort. Tinned co