Featuring glow-in-the-dark polarity indicators. The Polar-Glo clamp is ergonomically designed to be handled easily by everyone. This clamp grips remarkably to both top and side post batteries firmly and easily. The extended jaw has grooves which conform to the side post, locking it in place. The Polar-Glo clamp is the perfect solution to the problem of jumping side post batteries. UL Listed Extra Heavy Duty 4 gauge booster cables are suitable for starting all passenger vehicles and light trucks. 250% more power than 10 Gauge cables. The UL listing insures that these cables meet or exceed Underwriter Laboratory's strict manufacturing and safety standards. The 20 foot length allows passenger vehicles to be parked front to back. Polar-Glo clamps glow in the dark to insure correct connection to battery terminals. Complete "Jump Starting" instructions printed on the carton. Made in the USA. Limited Lifetime Warranty.