Nes Internal Thread Repair Kit,  5/16"  to 1 1/4", 4-Piece, NES1008 Capacity is 5/16 to 1 1/4-Inch One hand tool restores inch or metric, right handed or left handed fastener threads Floating cutters are self-adjusting to any pitch and size within range No need for calibration or identifying thread types Automatically chases good thread sections to repair the damaged parts