... ,ISO,GB,IFI and NON-STANDARD 3.Finish:PL,ZP,HDG DIN6916 heavy-duty washer1.Size:M3-M642.Standard:DIN,ISO ... ,GB,IFI and NON-STANDARD3.Finish:PL,ZP,HDG,sheradizing,plain,black oxide,Zinc plated(blue,white and yellow ... or bulk is according to the clients. stainless steel washer,bolt,nut,screw