If you've had to drill out a sheared shaft these can clear remnants from the hole. If the thread is damaged it shaves off the damage. As a last resort drill it larger, tap a new thread and use a larger shaft for the repair (if the assembly will allow it).

• Repair damaged internal threads.

• Clean dirty internal threads.

• Cut new internal threads.

• Buy a T-handle if not included.

• Available as a kit with a matched drill bit.

• Consider a full tap, die and drill set.

• Always wear eye protection.

• Consider impact protection.