1)flat / spring washers 2)size:M3-M65 3)material:stainless steel,carbon steel,brass... 4)Surface:Zp (CR3+,CR6+),Plain,HDG flat / spring washersSize:M3-M65Material:stainless steel, carbon steel, brass...Surface:Zp(CR3+,CR6+),Plain,HDG,Black... plain washer/spring lock washer stainless steel/zp