... , stainless steel Finish:Plain,ZP,YZP,Black,HDG,Nickel,Chrome Internal teeth lock washersMaterial: Carbon steel, mild steel, stainless steel.Finish ... lock nuts, cap nuts, slotted nuts, rivet nutWASHERS: flat washers, spring washers, lock washersSCREWS: machine screws, self tapping screws, set screws ... drilling screws Welcome to inquiry, please contact me 0086-13375150195, Internal teeth lock washers