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. Ungalvanized. Size: Body dia: 16mm, Opening: 26mm, Thread Bolt & Nut: M18, Clear Length: 54mm, Pin dia: 19mm, S.W.L: 1.6ton.