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Grade 4.8 GB12 M6-M20 Dacromet Button Head Square Neck Bolt Slender Rod Full Thread Carbon Steel/Alloy Steel, Find Details and Price about Button Screw GB12 Bolt from Grade 4.8 GB12 M6-M20 Dacromet Button Head Square Neck Bolt Slender Rod Full Thread Carbon Steel/Alloy Steel - Hunan Standard Industrial Products Co., Ltd.