GearWrench 2229D External Thread Restorer File SAE 11, 12, 13, 14, 16, 18, 20, 24 Pitch The GearWrench 2229D External Thread Restorer File SAE 11, 12, 13, 14, 16, 18, 20, 24 Pitch quickly restores threads with durable, fast cutting teeth. Used to restore worn or damged external threads on bolts and pipes, the GearWrench 2229D External Thread Restorer File SAE 11, 12, 13, 14, 16, 18, 20, 24 Pitch files both right and left hand threads.