Nes Universal External/Internal Thread Repair Kit NES1A, 21, 22, 23, 4-Piece, NES1017 External Capacity is 5/32 to 11/16-Inch Internal Capacity is 5/16 to 13/16-Inch One hand tool restores inch or metric, right handed or left handed fastener threads No need for calibration or identifying thread types Floating cutters are self-adjusting to any pitch and size within range