Shackle/rigging: Material: die forging steel 45# Surface: galvanized, hot dip Certificate: SGS US round pin type Shackle/rigging:Material: die forging steel 45#Surface: galvanized, hot dipCertificate: SGSUS round pin typeField: railway, voyage, aviationSize: 1/4", 5/16", 3/8", 1/2", 5/8", 1", 1-1/4", 1-1/2", 1-3/4", 2" shackle/rigging