The RA18-4 is a ring terminal insulated with high dielectric-strength nylon for wire range #22 - #16 AWG. An inner bronze insulation grip sleeve lengthens the flexing radius of the conductor and eliminates conductor creep. Length .72 inches, .23 inches width, maximum insulation .136 inches, bolt hole #4. The terminal is high-conductivity electrolytic copper, electro-tin plated, with color-coded insulation. Recommended tool ERG2001.