Product details:

Features and Benefits External Capacity is 5/32 to 11/16 Internal Capacity is 5/16 to 5/8 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 Nes 1015 is a 3 piece combination set for both external and internal thread repair. This set comes with one external and two internal tools. The Nes 1A external thread repair, which has a working capacity from 5/32 - 11/16.