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4.8/8.8 DIN 603 Carriage Bolt White Blue Zinc High Strength Round Head Square Neck Bolt Factory Direct Supply Carriage Bolt, Find Details and Price about Bolt Carriage Bolt from 4.8/8.8 DIN 603 Carriage Bolt White Blue Zinc High Strength Round Head Square Neck Bolt Factory Direct Supply Carriage Bolt - Hebei Zhuding Fastener Manufacturing Co., Ltd