The most common type is the spiral-shaped woodworking drill bit, which is spiral-shaped with a central tip and two side cutting edges. The spiral flutes allow for rapid sawdust removal during drilling, making it suitable for drilling ordinary wood and everyday processing.
The flat drill (also called a woodworking flat drill) is flat with a central guide tip and transverse cutting edges on both sides. It is characterized by fast drilling speed and larger hole diameter, often used for roughing out tasks such as door lock holes and wire hole drilling, but the hole wall precision is relatively average.
The woodworking hole drill or Forstner drill bit typically has a circular cutting structure at the front end with a central locating tip. This type of drill bit can process flat-bottomed holes, countersunk holes, or high-precision large holes, producing clean hole edges, and is commonly used for furniture hardware installation and fine woodworking.
There are also special shapes such as extended drill bits, three-point drills, and tapered drills. Three-point drills emphasize positioning stability, while tapered drills are suitable for reaming or chamfering. The design of different shapes is essentially to adapt to different drilling sizes, depths, and processing precision requirements.
