... Material: Carbon steel, mild steel, stainless steel Surface treatment:Plain,ZP,YZP,Black,HDG, Nickel, Chrome DIN6796 Material: Carbon steel, mild steel, stainless steelSurface treatment:Plain ... , cap nuts, slotted nuts, rivet nutWASHERS: flat washers, spring washers, lock washersSCREWS: machine screws, self tapping screws, set ... inquiry, please contact me 0086-13375150195 DIN6796 Conical spring washer