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Heavy Duty Brass Clamps/Battery Clamps/Booster Cable Clamps with 300-500AMP. High Current Capacity: Supports 300-500AMP for heavy duty electrical applications. Durable Brass Construction: Made of copper with brass clamps for strong conductivity and longevity. Secure Grip Design: Strong spring mechanism ensures terminals hold firmly without falling off. Insulated Safety Cover: Features PVC insulation in red and black for safe operation. Certified Quality: Products are ISO and CE certified for international standards.