Professional Armorer's Wrench3 4 inch wrench for A2 muzzle devices and designed to work with the thin flats on many of the popular suppressor mounts Castle nut driver with 3 notch engagement Combat bottle opener Small hammer head Torque specs features on wrench handle Constructed from 4140 heat treated steel 1 2 Inch drive for torque wrench (2) Designed to work with 5. 56 and 7. 62 AR platform rifles components. Works with encapsulated and pin style barrel nuts including the GI