A drop forged, carbon steel shackle with an eye bolt which has metric coarse threads at one end. Please specify Ungalvanized (Black) or Galvanized shackles is required. Ungalvanized. Size: Body dia: 10mm, Opening: 20mm, Screw Pin Thread: M12, Clear Length: 34mm, Pin dia: 12mm, S.W.L: 0.4ton.