Building Wire, THHN, 1 AWG, Black, 500 ft/ CROSS-SECTIONAL SHAPE STYLE: 6 ROUND TEMP RATING: 194.0 DEG FAHRENHEIT OUTSIDE DIAMETER: 0.435 INCHES NOMINAL ALL CONDUCTORS STRAND QUANTITY PER CONDUCTOR: 19 ALL CONDUCTORS CONDUCTOR FORM: STRANDED ALL CONDUCTORS ROUND CONDUCTOR SIZE: 1 AWG SINGLE CONDUCTOR VOLTAGE RATING: 600.0 AC MAXIMUM RATED WORKING VOLTAGE SINGLE CONDUCTOR SPECIAL FEATURES: WEIGHT 160 POUNDS COLOR: BLACK 1ST POSITION SHIELD SOLID FIRST GROUP