Nes, outer thread repair tool

For professional workshop use. Hand tool used to restore up to 60% damaged threads on bolts, studs and other external threaded parts. Comes with special hardened HSS tool steel blades. Installs to the thread diameter by rotating the serrated knob, after which the bolt is rotated in the tool. Automatically adjusts to the thread pitch since the blades are guided by chasing undamaged sections of the threads. Compatible with M4 to M19 or 5/32" to 3/4" diameter threads.