Standard:DIN127B, DIN7980, ASME B18.21.1 Material:Steel, SS A2 (304), SS A4 (316) Finished:PLAIN, ZP, ZYP, BLACK, HDG Class / Grade:Spring Steel, A2, A4, SS304, SS316 Diameter:M3 - M30 & 1/4" - 1.1/2"