1. Tungsten
  2. Chromium
  3. Silicon
  4. Cobalt
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1 Answers

Answer: Option 4

the material that makes up the tools and inserts, is actually grains of tungsten carbide, along with particles of other materials, cemented together using the metal cobalt as a binder. There are several tungsten ores that can be mined and refined into tungsten or made into tungsten carbide

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