... .certification: SGS,Rohs din 603 zinc plated grade 8 carriage bolt in hardwarematerial:steel ,stainless steel,brass, ... finish:galvanize,cleaning,phosphatingtreatment:heat treatmenttest:salt spary testfeature:Eco-friendlyApplication: computer, machine accessories,orther products component.packing ... etc.SizeM5-M64,1/4”-3/4”Length3mm-160mm, 1/8”-12”ThreadMetric, UNC, , BSWFinishPlain, Galvanized, Black, H. ...