We are manufacture and our Product Detail as below :
Standard Germany Standard: DIN933, DIN931
Grade 4.8, 5.8, 6.8, 8.8, 10.9, 12.9
Size Diameter: M6-M48
Pls contact with me
Emma
Email :sale08@hsfaastener.net
skype :haosheng.fasteners3
qq:2082368674