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What is the hardest drill bits... HSS,Tungsten Carbide or ?
i need a miniature 0.8mm for PCB type works.. it will be drilling fibreglass sheet alot
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- 1 decade agoFavorite Answer
Use a stubby bit. They are high in cobalt content and will last a long time. This bit is also very useful for drilling stainless steel. My next choice would be titanium coated high speed steel. If you are using a drill press, slow your speed down to improve bit life.
Source(s): experience
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