The RD10721 is a large ring terminal insulated with high dielectric-strength nylon for wire size 8AN. These ring terminals have funneled barrel entry, deep internal serrations, and brazed or overlapping seams. Length 1.53 inches, .56 inches width, maximum insulation .270 inches, bolt hole 5/16 inches. The terminal is high-conductivity electrolytic copper, electro-tin plated, with color-coded insulation. Installing tool ERG4007.