TP-916 Thread Protector MAXIM Silencer thread pattern for .25-.35 caliber | IMPROVED GUNSProtect those Historical threads on your vintage rifle with our made in house thread protectors!This Thread Protector is suitible for .25-.35 caliber rifles threaded for the legendary Maxim Silencer!*Product of IMPROVED GUNS - ELLIJAY, GA.Material- Blued Steel ar15 AR-15 ar10 AR-10