... 8,9.8.... Copper Bolts,Copper Bolt,Brass Bolts.1.What’s the specification of our Products ? MaterialsCarbon steel,Stainless ... ,Tin plated,Black phosphating ,anodized ,Parkerising,and Environmental Plated is used in our products,Hexavalent chromium are accord with ROHS Standard.Weight ... for your best view:1) applicable scope:They are used in most of places such as drywall,concrete,chipboard,machine,wood ...