Also known as screw-machine and stub-length bits, these provide maximum rigidity for drilling straighter holes than jobbers'-length drill bits.

Three cutting edges instead of the typical two enable these bits to drill holes with a smoother finish than other bits.

The parabolic spiral flutes lift chips out of the hole, reducing clogging and improving coolant flow.

Harder, stronger, and more wear resistant than carbide-tipped steel, solid-carbide bits maintain their sharp edges longer. They require rigid toolholding to prevent breakage and should not be used in hand-held drilling applications.

These jobbers'-length bits have the rigidity and length required for most applications.

Harder, stronger, and more wear resistant than high-speed steel, solid-carbide bits maintain their sharp edges longer. They require rigid toolholding to prevent breakage and should not be used in hand-held drilling applications.