Our 8 pack of threaded jam nuts is perfect for your precision bolt action rifle or AR15 or similar sporter rifle. It allows you to perfectly time your muzzle brake or compensator or suppressor without the use of a work bench or vise. Keeps the install process overall simple and only requires a thin open end wrench to tighten down. Precision machined from stainless steel. Please ensure your barrel is threaded 1/2-28 thread pitch.