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HDG A325m Hex Bolt with Nut Washer Used for Steel Structure. Customizable Packaging: Supports customized packaging such as wooden cases and iron barrels. High Stock Availability: Over 100 tons of bolts in stock to accept small orders. National QC Standards: Testing center granted as National Enterprise Technology Center. Fast Delivery for Stock: Delivery takes about 3 days if items are in stock. Professional Manufacturer: Leading manufacturer founded in 2007 with 18 years export experience. Comprehensive Certifications: Passed ISO9001, ISO14001, ISO45001, CE, and SGS certifications. Wide Size Range: Available in diameters M12-M36 and lengths 35mm-255mm. Complete Bolt Sets: Sets include 1 bolt, 1 nut, and 2 washers for easy installation.