The RC10-12 is a ring terminal insulated with high dielectric-strength nylon for wire range #12 - #10 AWG. An inner bronze insulation grip sleeve lengthens the flexing radius of the conductor and eliminates conductor creep. Length 1.37 inches, .72 inches width, maximum insulation .210 inches, bolt hole 1/2 inches. The terminal is high-conductivity electrolytic copper, electro-tin plated, with color-coded insulation. Recommended tool ERG4001.