1place of origin:Guang dong China(mainland) 2material:brass 3size:M3-M26 Brass Bolt1place of origin:shenzhen city of Guangdong province2material: Brass, copper, bronze 3size: M3-M26 4finish: Zinc, Nickel, Chrome, sliver, gold, tin 5 Non-standard parts can be produce according to the sample 6certificate:RHOS ISO 2008 brass bolt