A drop forged, carbon steel shackle with an eye bolt which has metric coarse threads at one end. Please specify Ungalvanized (Black) or Galvanized shackles is required. Galvanized. Size: Body dia: 52mm, Opening: 104mm, Screw Pin Thread: M56, Clear Length: 177mm, Pin dia: 62mm, S.W.L: 12.5ton.