Standard DIN Grade 4.8/6.8/8.8/10.9/12.9 Finish Carbon Steel/Steel: Zinc (Yellow, White, Blue, Black), Hot Dip Galvanized (HDG), Black, Geomet, Dacromet , Anodization, Nickel plated, Zinc-Nickel plated, Teflon(PTFE), etc. Material Carbon steel/Alloy steel Size M6-M80,1/4-3 or as your requirement.