A weldless, drop forged, carbon steel shackle with an eye bolt which has metric coarse threads on the end. Please specify Ungalvanized (Black) shackle or Galvanized shackle is required. Ungalvanized. Size: Body dia: 18mm, Opening: 36mm, Screw Pin Thread: M20, Clear Length: 89mm, Pin dia: 21mm, S.W.L: 1.3ton.