A twist drill is a tool that drills a circular hole in a workpiece through its rotational cutting relative to a fixed axis. Named because the chip flute is spiral-shaped and resembles a twist. Spiral flutes have 2, 3 or more flutes, but 2 flutes are the most common. Twist drills can be clamped on manual or electric hand-held drilling tools or on drilling machines, milling machines, lathes and even machining centers. The drill bit material is generally high-speed tool steel or cemented carbide.

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