1.material:65Mn 2.Hardness:HRC38-50 2.Specifications:M5 3.Finish:,Nickel plated, zinc plated 1. Item name: u nut from china2. Material: stainless steel, iron, copper, aluminum, carbon steel3. Surface treatment: nickel, white zinc, blue zinc, color zinc, yellow zinc, black zinc, chrome4. Standard: JIS, BS, GB, ISO, DIN, AISI5. Size: all sizes6. The use of this product is very broad, can be used ...