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10b21 Carbon Steel Double Thread Hanger Bolt. High Strength Grade 8.8: Made of premium SAE 10B21 boron steel with heat treatment for Grade 8.8 strength. Double Thread Design: Features a self-tapping tip and machine thread for versatile installation. Zinc Plated Finish: Surface is zinc plated to provide corrosion resistance and durability. Customizable Options: Product specifications and requirements can be customized to meet specific needs. ISO Certified Quality: Manufacturing process meets ISO certification standards for quality assurance.