Which of the following tools is essential for the initial drilling out of rivets?

The tool that is essential for the initial drilling out of rivets is the drill. When it comes to removing rivets, especially in aircraft assembly and maintenance, the process typically begins with drilling a hole through the center of the rivet. This is done to weaken the rivet and facilitate its removal. The drill allows for precision and control when making the initial incision, which is crucial for not damaging the surrounding materials.

Using a drill ensures that the rivet is effectively broken down without risking integrity to the surfaces around it. It is important to select the correct drill bit size appropriate for the diameter of the rivet, as this will optimize the efficiency of the operation. The drill's capability to create a clean hole makes it indispensable for this aspect of rivet removal, setting the stage for subsequent steps, such as using a punch or other tools to fully extract the rivet.