This adapts your metric 7.62x39 VZ58 barrel to the standard 7.62 (5/8-24) thread pitch for muzzle devices and suppressors.

Features and Specifications:
Manufacturer Number: VZ58 TA
Material: Steel
Color: Black Nitride
Tools required: 17mm Wrench
Thread Adapter
5/8-24 TPI outside threads
M14x1.0 RH inside threads