Standard UNI Grade 2H/2HM/7M/7L/8/8M 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/ stainless steel/ Alloy steel Size M6-M100,1/4 -4 or as your requirement.