• Black oxide is a blue gray-colored coating that combines good hardness in high heat with high oxidation resistance. This coating has excellent wear resistance. Good for use on ductile cast iron and mild and high carbon steels.
  • Gold oxide is a low temperature heat treatment which reduces grinding stress within the tool, and has an appealing, easy-to-identify gold color. Gold oxide is commonly used to identify cobalt steel tools.
  • Uncoated (bright) tools have no finish or coating. They are a common choice for general use applications.