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2020-9-16 · Cobalt drill bits are ideal for when you need to drill through hard metals. They come in two grades: M35, which is made of 5% cobalt, and M42, which is made of 8% cobalt. Because they can handle temperatures as high as 1100 °F, cobalt drill bits can be used in high-heat settings. The higher the percentage of cobalt, the more heat-resistant it ...
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