A drop forged, carbon steel shackle with an eye bolt which has a metric coarse thread on one end. Please specify Ungalvanized (Black) or Galvanized shackle is required. Galvanized. Size: Body dia: 18mm, Opening: 29mm, Thread Bolt & Nut: M20, Clear Length: 61mm, Pin dia: 21mm, S.W.L: 2ton.