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 carbon steel and finished off in black nitride for a sleek black look. Please ensure your barrel is threaded 1/2-28 thread pitch.