Weldless, drop forged, carbon steel shackle with an eye bolt which has a metric coarse threaded end. Please specify Ungalvanized (Black) or Galvanized shackle is required. Ungalvanized. Size: Body dia: 18mm, Opening: 29mm, Screw Pin Thread: M 20, Clear Length: 84mm, Pin dia: 21mm, S.W.L: 2ton.