That leaves a round disk or core of material. Step bits function as multiple drill bits in a single tool. Instead of a cylinder, these are cone-shaped, with a distinctive stair-step profile.

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.

The first step in drill bit design is to identify the objectives and constraints of the drilling project. What are the target formation, depth, and diameter of the well? What are the expected ...