Prevent clogs that wear the bit and slow down drilling. The flutes on these bits have an open design that pulls chips out of the hole faster than standard spiral flutes. Also known as pole or ship auger bits, they are used to cut deep holes through lumber, railroad ties, and utility poles.

Not only do these bits bore holes faster than standard smooth-finish bits, they create less friction and heat buildup to last longer. The spurred teeth have a long life, but they're less effective at guiding the bit so cuts on angled and overlapping holes tend to be rougher. Also known as multispur bits.

Center holes perfectly before installing hinges, latches, and other hardware that require a countersunk screw. These bits have a built-in guide with a beveled tip that keeps the bit in position as it enters the material. So instead of measuring and marking, use your hardware as a template to drill the pilot holes. Once screws are installed, they're straight and the heads are flush. Also known as Vix bits, they're made of wear- and heat-resistant high-speed steel.