What is a countersink?

A countersink is a conical hole that is typically created in a material, such as metal, wood, or plastic, in order to allow a screw head to sit flush with or below the surface of the material. This helps to prevent the screw head from protruding and creating a potential hazard or hindrance.

Countersinks can be created using specialized tools called countersink bits, which are typically attached to a drill or other power tool. These bits typically have a conical shape that matches the angle of the screw head, allowing for a precise and clean countersink to be created.

Countersinks are commonly used in woodworking, metalworking, and other manufacturing applications where screws or fasteners are used to join materials together. They help to create a neat and professional finish to a project, as well as ensure that the screw heads do not interfere with the functionality of the finished product.