These 4 gauge booster cables stretch 20 feet long to easily reach from one vehicle engine to another. Constructed with copper-plated steel the clamps provide 250 percent more power than 10 gauge and feature a thick vinyl coating for protection against rust and corrosion. These weather-resistant automotive cables are color-coded black and red for polarity identification. Remain flexible up to minus 40 degrees F. Generally a gauge of 4 or 2 is recommended for jump-starting a semi truck. These booster cables are specifically designed to meet the demanding needs of jump-starting a truck or car battery. With an impressive length of 20 feet (6.1 meters) these cables provide an extended reach allowing you to effortlessly connect from one vehicle engine to another. No matter where your truck battery is located these cables have you covered. even in challenging spaces. A vinyl coating is added to the heavy-duty steel clamps effectively shielding them against rust and corrosion. The black and red color scheme enables quick and accurate polarity identification eliminating any guesswork during the connection process. You can connect with confidence.