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: 20mm, Opening: 31mm, Thread Bolt & Nut: M24, Clear Length: 68mm, Pin dia: 24mm, S.W.L: 2.5ton.