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: 28mm, Opening: 56mm, Screw Pin Thread: M33, Clear Length: 95mm, Pin dia: 34mm, S.W.L: 3.5ton.