... m45 3.other material :(low)carbon steel 4.finish:ZP,YZP,Plain,Black,Pla 1.stainless steel (304/A2,316/A4)2. ... .finish:ZP,YZP,Plain,Black,Plain304,316 M8 stainless steel washers material: 304 / A2 , 316 / A4size:M3-M45 OR non-standard ... plain washerOur washers:Size : standard or non-standardMaterial : carbon steel / low carbon steel / mild carbon steel / stainless steel (A2/304 , A4/316) ...