grade 8.8 bolt specification: 1Materials:Carbon steel 2Size:M24*80,27*130,30*270 3Surface:Black,Zinc,Dacro 4Certificate: ... the product:1Materials: 1045, 45#, 40Cr, 35CrMoA, Q345D, etc. 2Size: M24*80,27*130,30*270 3Standard: DIN, ASTM, GOST, JIS ...