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DIN6921 En1662/1665 Zinc Plating/Coating Blackening Grade B/5/8/8.8/10.9 Serrated Hex Flange Bolt, Find Details and Price about Serrated Flange Bolt Hex Flange Cap Bolt from DIN6921 En1662/1665 Zinc Plating/Coating Blackening Grade B/5/8/8.8/10.9 Serrated Hex Flange Bolt - Ningbo Hilow Hardware Co., Ltd.