Booster cable clamps are designed to grip securely to side terminal/post terminal batteries, and remote battery access terminals for maximum current carrying capacity. Each set of booster cable clamps are color coded (Red/Black) for both safety and visual appeal. This 600P Extra Heavy-Duty Clamp is a parrot type clamp and is designed for use with 2 and 4 gauge cable. This product has been identified for battery chargers, booster cables, and electrical equipment.