Also known as mechanics' bits, these are shorter and more rigid than jobbers’ bits but longer than short-length bits.

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

The short flutes on these jobbers'-length bits provide increased rigidity for drilling straighter holes.

For the highest accuracy and longest tool life, these solid-carbide bits are harder, stronger, and more wear resistant than high-speed steel, cobalt steel, and carbide-tipped bits.

More wear resistant than cobalt steel and high-speed steel, carbide-tipped bits maintain a sharper, harder edge at high temperatures for excellent performance on abrasive material, such as plastic. Because they aren’t as brittle as solid carbide bits, they can be used in less rigid setups, such as a hand-held drill.

With better heat and wear resistance than high-speed steel, cobalt steel bits can run up to 25% faster and have a longer tool life.

Steps with progressively larger diameters let you drill a range of sizes with one bit. Also known as step drills.

Enlarge existing holes without changing the depth.