A durable metal clamp tool for QCBC AAD Clamp is made in the USA, of a Zinc Alloy that is relatively corrosion resistant which means it can be used in a wet and dry location without fear of rusting or corroding over time. Zamak 3 is a zinc-based alloy that is strong and durable. AAD clamp has a double cable for heavy-duty, as per diesel. Zamak 3 is resistant to corrosion and wear, making it ideal for outdoor use and various applications.