US type chain shackle: Material:forged steel 45# Certificate: SGS Surface: galvanized, hot dip All sizes are available US type chain shackle:Material:forged steel 45#Certificate: SGSSurface: galvanized, hot dipSize: 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 5/8", 1", 1-1/8", 1-1/4", 1-3/8", 1-1/2", 1-3/4", 2", 2-1/2" US type chain shackle