Final answer:
To drill the large hole for the door knobs when replacing a door lock, your customer will need a hole saw bit. It is important to choose the right size and follow safety precautions when using power tools.
Step-by-step explanation:
To drill the large hole for the door knobs when replacing a door lock, your customer will need a hole saw bit. A hole saw bit is a circular saw blade with teeth that can cut through doors and other materials to create a large hole. It is commonly used for tasks like installing door knobs or drilling holes for pipes.
When using a hole saw bit, it is important to choose the right size to match the diameter of the door knob. The bit should be attached to a drill, and the user can then guide it through the door to create the hole. Make sure to follow the manufacturer's instructions and take proper safety precautions when using power tools like drills.