Thread Restorer, Manufacturer suggested retail price. $16.27 Features and Benefits: Restore external threads by filing Overlap several good threads with file and file damaged ones Files right and left hand threads Long lasting, fast cutting teeth Sizes: 0.75mm, 1.00mm, 1.25mm, 1.50mm, 1.75mm, 2.00mm, 2.50mm, 3.00mm Manufacturer: KD Tools Lifetime warranty does not cover abuse