Lang Tools (Kastar) 51-2644-0005 - National Fine Rethreading Die 1/2"-20

Features and Benefits:

• For repair of damaged internal threads on nuts
• Chase out damaged threads and remove nicks and burrs without undercutting good threads
• 6-pt. shaped for use with socket or wrench, and light oil
• Never use to cut new threads
• Highly tempered for strength and durability
• Black phosphate plated
• LANG - Thread Restorers Dies