This wrench plate is machined with a 1/2″ square for use with a torque wrench. It has 9 hardened pins in a pattern that creates excellent engagement with the barrel nut so as to not damage or slip during installation or removal. There is a cutout for the installation / removal of a flash hider / muzzle brake and has rounded contact areas to lessen the chance of damaging the flash hider / muzzle brake. It has a second cutout that fits the standard receiver extension tube. Made in USA