A weldless, drop forged, carbon steel shackle with a hexagon, metric coarse threaded bolt, nut, and a split pin hole at the other end. Please specify Ungalvanized (Black) or Galvanized shackle is required. Galvanized. Size: Body dia: 20mm, Opening: 31mm, Thread Bolt & Nut: M24, Clear Length: 92mm, Pin dia: 24mm, S.W.L: 2.5ton.