What is the difference between a Frostner bit and a self-feed bit?

• A. The shank diameter
• B. The cutting edge angle
• C. The number of teeth
• D. The material

Answer: (C)

The important idea here is how many cutting edges are doing the work around the hole. A frostner (often called a Forstner) bit cuts with a rim that has many small cutting teeth all around, plus a center guide, which lets it slice cleanly and produce a flat-bottom hole. A self-feed bit, on the other hand, uses a different tooth setup—fewer teeth on the rim and a screw tip to pull the bit into the wood—so it drills faster but with a rougher finish. Because the number of teeth directly affects how clean the cut is and how the material is removed, that difference is what sets these two bits apart.