Harbor Freight has driver and impact, twist, woodboring, masonry, and step drill bits available. If you're drilling through softer material like wood, twist bits should serve you just fine.

Do you have a drill bit that's too dull to use? You can sharpen it rather than replacing it if you have a bench grinder, but ...

The most commonly-available form of this drill bit is the type with a 135-degree tip. It’s designed for drilling metal, but it will also drill wood.

Twist drill A standard drill bit with two twisted, fluted cutting edges to remove material Wood Flat drill Has a flat face, a pin at the bottom, and two cutting edges. Allows for a flat blind hole ...