The 6600# Safety Chains 3/8 Grade 70 ZP offer a Safe Working Load (SWL) of 6,600 lbs and an Ultimate Break Strength of 26,400 lbs. Made from high-strength Grade 70 steel and coated with a zinc-plated finish (ZP), they deliver superior durability and corrosion resistance, making them ideal for heavy-duty lifting, securing, and tie-down applications in tough environments.