Place of Origin::Guangdong China (Mainland) Certification::ISO, ROHS Service::OEM,ODM size::M1-M20 material::brass.stainless steel ,iron,aluminum etc. surface treatment::nickel zinc tin plated ,polishing ,HDG, product name::aluminum washer Standard::DIN,ANSI,BS,JIS, Finish:black,zinc plated, plain, nickel plated, etc. Brand Name::Chuanghe