The RK9721 is a large ring terminal insulated with high dielectric-strength nylon for aircraft wire size 2/0AN. These ring terminals have funneled barrel entry, deep internal serrations, and overlapping seams. Length 2.53 inches, .93 inches width, maximum insulation diameter .610 inches, bolt hole 5/16 inches. The terminal is high-conductivity electrolytic copper, electro-tin plated, with color-coded insulation, rated for 105°C max temperature. Installing tool TBM6S.