The Midwest Industries AR Professional Armorer's Wrench is designed to work with 5.56 and 7.62 AR platform rifles components. The wrench works with encapsulated and pin style barrel nuts including the GI style nut. Drive end is compatible with all Midwest Industries free float barrel nuts. Tool also includes a A 3/4 inch wrench for A2 muzzle devices and designed to work with the thin flats on many of the popular suppressor mounts. FeaturesCastle nut driver with 3 notch engagementCombat bottle opener Small hammer headTorque specs features on wrench handle.Constructed from 4140 heat treated steel