... : mild steel; carbon steel; spring steel; stainless steel; 4.Surface treatment: plain; black; zinc-plated (ZPCR3+; ZPCR6+; ... DIN127B.DIN7980ANSI)3)Square washer (DIN434.DIN435.DIN436)4)Nonstandard washer:Grea Lock washer,sawtooth lock washer ... drop in anchor,wedge anchor,bolt anchor,sleeve anchor, hit anchor, quick anchor,nylon hammer fixing,tie wire anchor,cut anchor,hollow wall anchor,coupling nut ...