METRIC Diameter: M6~M30 Finish: Zinc,Plain,HDG,BLACK Grade: 4.8,6.8,8.8 Material: Carbon Steel Specification: DIN 985 Technical Data: 点开连接 INCH Diameter: 1/4 ~ 1 1/2 Finish: Zinc,Plain,HDG,BLACK Grade: 2,5, Material: Carbon Steel Sp...[more]