The RA2257 is a vinyl-insulated locking fork terminal for wire range #22 - #16 AWG. Locking fork terminals have a specially designed tongue that lets them go on like a fork and stay on like a ring. Length .97 inches, .29 inches width, maximum insulation .150 inches, bolt hole #10. The terminal is high-conductivity electrolytic copper, electro-tin plated, with color-coded insulation. Recommended tool ERG4001.