Screw pin anchor shackle. Drop forged steel. Hot dipped galvanized. Working Load Limit: 3-1/4 Ton. Forged to comply with Federal Spec. RR-C-271b. Sea-Dog Line is a 3rd generation family company with a history of satisfied customers stretching back to the company's start in 1933. The company is the recipient of multiple industry awards for quality and efficiency.