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Pick out the correct size countersink bit for your next project and start drilling with precision today.Each countersink bit we offer here is made in the USA from high-speed steel. This high-speed steel makes these countersink bits tougher and longer-lasting for use on harder, abrasive materials. And they can even withstand much higher temperatures too.You can't go wrong with a countersink bit from Bits & Bits. These are designed to be extremely precise, allowing you to sit screw heads perfectly flush right where you want them.