Detailed Product Description 1) Standard: :DIN,ASTM,JIS,ANSI 2) Material: Carbon steel 3) Grade: Grade 4.8, grade 8.8 4) Dimension: 2.2-6.35) Length: 9.5-506)Thread: Fine thread and Coarse thread6) Coating: Nature, Zinc plating, blackening, hot dip zinc, environment-friendly zinc plating