Part of the Hellfire Modular Brake System.  

HELLFIRE WRENCH

• 5/8″ hex for tightening the Hellfire Universal Adapter onto the muzzle
• 1-1/8″ Internal hex for installing Gen 2 Hellfire Suppressor Mounts
• 1-1/8″ External wrench for emergency removal of stuck suppressor mounts
• Bottle Opener for removal of bottle caps 
• Machined from solid 6061-T6 bar stock