... 39 2 Size:All size are available 3 Material:45#steel... It is welcomed to send us your sample parts, ... informations.1)Ingredients: 45 # steel quality; 2) Surface treatment: Electrophoresis & Galvanization Plated nickel chrome, nickel, chromium plating technology, polishing, sandblasting mist ... bore diameter: 32mm, outer diameter: 45mm, M16All sizes are available. zinc plating eye bolt towing hook