An open spiral-flute design clears chips quickly, so these bits can bore smooth, deep holes through construction lumber, railroad ties, and utility poles. Also known as pole or ship auger bits.

Tapered square/round-shank drill bits have a tapered square shank that can be cut off to expose a round shank.

Hex/round-shank drill bits have a hex shank that can be cut off to expose a 1/2" round shank.

Black-oxide and clear-coated steel drill bits produce less friction than uncoated steel drill bits.

For technical drawings and 3-D models, click on a part number.