Drop forged carbon steel shackle with a hexagon, metric coarse threaded bolt, which has a split pin hole at the end and a securing nut. Please specify Ungalvanized (Black) or galvanized shackle is required. Ungalvanized. Size: Body dia: 20mm, Opening: 31mm, Thread Bolt & Nut: M24, Clear Length: 68mm, Pin dia: 24mm, S.W.L: 2.5ton.