Which tool is typically NOT used for countersinking procedures?

The counterbore tool is typically not used for countersinking procedures because it is designed for creating a cylindrical recess around a hole, allowing the head of a bolt or screw to sit flush with or below the surface of the material. In contrast, countersinking specifically involves creating a conical-shaped recess that allows the head of a screw or bolt to sit flush with the surface or slightly below it, providing a smooth finish.

Each of the other tools serves a direct role in countersinking tasks. A fluted countersink tool features sharp edges that remove material to form the countersunk shape. The microstop allows for precise depth control during the countersinking process, making it easier to achieve the desired depth on multiple holes consistently. The countersink tool is essentially meant for the same purpose as the fluted countersink, being able to create the necessary recess shape for screw heads. Therefore, while both the fluted countersink and the countersink tool directly engage in the countersinking operation, the counterbore tool does not align with this function.