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Auto black bolts
Specification:1.Grade:8.8,10.9,12.92.Material:carbon steel,35steeland customization3.Surface:zinc plating,black,customized
4.Colour:Gold,silver,yellow
5.Technique:forging,rolled and grinding,punching
Auto black bolts,bolts,black bolts,auto bolts,M.S.auto black bolts DIN933(4.8grade)