4120-050N 2/0 GA Crimpable Negative Right Clamp Battery Connector (50 PCS) - Quick Connectors are the only battery connectors that exceed SAE standard, are UL listed and are made in North America. Made of cast copper and tin plated for added conductivity and corrosion resistance, these connectors have 25 times better conductivity than the SAE standards J163 and J1811 require. Each clamp is permanently and indelibly marked with readable gauge and polarity.