This is a Class 4 Safety Chain from Buyers Products is rated to 10,000 or 15,000 lb depending on the model.
The chain is zinc-plated to withstand corrosion. Available in a range of sizes and lengths, the chains feature forged slip hook connectors.
Use two safety chains with a total holding capacity of at least the total weight of the trailer and its contents. The chains are designed for towing only, not for lifting.
BP-BSC3835: 3/8x35 Inch Class 4 Trailer Safety Chain With 1-Clevis Style Slip Hook-43 Proof
BP-BSC3842: 3/8x42 Inch Class 4 Trailer Safety Chain With 1-Clevis Style Slip Hook-43 Proof
Rated to 10,000 or 15,000 lb
Tough forged steel slip hook
Corrosion-resistant, heavy duty zinc-plated finish