The RC257 is a vinyl-insulated female disconnect for wire range #12 - #10 AWG. The unique construction of the female disconnect offers long-term dependability. The brazed seam serrated barrel provides maximum tensile strength. Length 1.03 inches, .29 inches width, maximum insulation .250 inches, tab size .250x.032. The terminal is high-conductivity electrolytic copper, electro-tin plated, with color-coded insulation for easy installation. Recommended tool ERG4001.