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Hardest drill bit material

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I need to upgrade drill bits. Some of my cheap ryobi bits are bent and wobbly. I am using a drill press to drill hundreds of precise holes in copper and pvc pipe. I also drill through stainless. Is carbide overkill ? I don't mind getting the hardest, non bending bit so my holes are precise. Or cobalt ? I don't mind spending the money for very precise drilling - so I don't waste materials.


Tungsten Carbide drill bits plus oil.
 
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