Caliber 6.5mm, Rifle Military, Law Enforcement and/or Shooting Sports, Imperium Muzzle Brake Hight Grade Steel Finish Black Nitride, thread M18x1, length 70mm, weight 115grams, diameter 24mm, Jam nut included for an easy installation, Code IM0006/N Audere San Marino. Heavy reduction of recoil and muzzle movements!