Tungsten carbide twist drill bits is a tool to drill the round hole of the workpiece through its rotary cutting relative to the fixed axis. It is named because its chip holding groove is spiral and looks like hemp. Spiral grooves have 2 grooves, 3 grooves or more, but 2 grooves are the most common. Twist drills can be clamped on manual and electric hand-held drilling tools or drilling machines, milling machines, lathes and even machining centers. Tungsten steel bit is made of tungsten steel, which has higher processing hardness, but is more brittle than high-speed steel, and is easy to break when used improperly.