A countersink bit is a tool that makes it easy to create a conical hole in a material, allowing screws or bolts to be countersunk or sunk below the surface. However, there are many other synonyms that can be used instead of countersink bit to describe this tool. These include pilot hole drill bit, countersink drill bit, countersink drill, countersinking bit and counterbore bit to name a few. These interchangeable terms can be used across a variety of industries and can make it easier to describe this important tool, no matter what you're working on.