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: 24mm, Opening: 39mm, Thread Bolt & Nut: M30, Clear Length: 81mm, Pin dia: 30mm, S.W.L: 3.6ton.