Final answer:
The included angle of a drill bit can vary, commonly being 118 degrees for general metal drilling and 135 degrees for harder materials.
Step-by-step explanation:
The question regarding the included angle of a drill bit does not specify a particular type of drill bit. In general, the included angle can vary depending on the material and application. For example, a general-purpose twist drill bit for metal has an included angle of 118 degrees, which is suitable for a wide range of materials. For harder materials, such as stainless steel, a drill bit with a 135-degree included angle is often used. There are also specialty drill bits with different angles for specific applications.