Standard:Hexagon socket cap screws / DIN 912 Size:All Size Material: Mild Steel,Medium Steel,40Cr Grade:4.8, 8.8, 10.9, 12.9 Standard:Hexagon socket cap screws / DIN 912Size:M5-M24Material: Mild Steel,Medium Steel,40CrGrade:4.8, 8.8, 10.9, 12.9Surface:Black,Zinc,Plain Hexagon socket cap screws / DIN 912