Screw pin chain shackle Standard shackle material: Drop-forged carbon steel Standard finish: Galvanized to ASTM A-153 specification Working Load Limit permanently shown on every shackle Design factor: 6 to 1 Other features: Meets Federal Specification RR-C-271 Type VII, Class Meets the design requirements of the following specification: Federal Specification RR-C-271, Type IVB, Grade A, Class 2 Order unit is "Each"