Standard: DIN933, DIN931, DIN558, DIN601, DIN960, DIN961, DIN7990, ASME B18.2.1, SAE J429 & ASTM A307 Size: M5-64. 8#-2 1/2"Property Class: 4.6 4.8 5.8 6.8 8.8 10.9.12.9, SAE J428 Grade 2.5.8.10 Material: Carbon steel, Stainless steel, BrassFinish: Plain, Black, Zinc, YZP, Black HDG. Nickel Plate, Chrome Plate Etc