... , the head is the hexagon, the teeth are machine wire teeth, 1,Products DetailesMaterial1.Stainless Steel:SS201, SS303 ... 8-M10Surface FinishingZn- Plated,Ni-plated,Passivated,Tin-plated,Sandblast and Anodize,Chromate, Polish,Electro Painting,Black Anodize,Plain ... DIN,JIS,ANSI,BSWManufacture ProcessHeading/washer assembly/Threading/Secondary machine/heat treatment/plating/Anti-slipping/Baking/QA/Package/ ...