... .Length:5mm-350mm 5:Mechanical strength: 4.8-12.9 grade Grade 12.9 wheel stud bolt with black plating Features:1 ... you requirement2.).Applicable For Benze3.)Standard:DIN, ANSI,JIS,BS,GB,ISO,etc.4.)Finish:black,zinc plated,dacromet,etc5.)Material ... some special about packing,we can meet your requirement. Grade 12.9 wheel stud bolt with black plating