... specification: 1Materials:Carbon steel 2Size:M24*80,27*130,30*270 3Surface:Black,Zinc,Dacro 4Certificate:ISO9 Different types of grade ... #, 40Cr, 35CrMoA, Q345D, etc. 2Size: M24*80,27*130,30*270 3Standard: DIN, ASTM, GOST, JIS, AS, etc. 4Grade: 8.8 ...