Griffin Armament 24mm x 1.5mm thread adapters give compatible AK platforms 1/2x28 or 5/8x24 threads. These aren't hardware store grade adapters. These adapters feature a raised surface that interacts with the muzzle face of the barrel rather than the front sight base, permitting vastly superior theoretical alignment accuracy than the detented and loose, rattle-trap devices common to these systems. For rifles that have clean muzzle faces that are perpendicular to the bore. We recommend 50ft lbs of torque for installation, and qualified gunsmith installation and alignment checks prior to suppressor use. 27mm wrench flats are provided for ease of installation.