Designed to work with 5.56 and 7.62 AR platform rifles components. Works with encapsulated and pin style barrel nuts including the GI style nut. It has Drive end for all MI free float barrel nuts - Including CRM, SLH, CRT, CRLW, ULW, G3M, G4M, SP Series-, a inch wrench for A2 muzzle devices and designed to work with the thin flats on many of the popular suppressor mounts. It also has a Castle nut driver with 3 notch engagement, Combat bottle opener, Small hammer head & Torque specs features on wrench handle. It is Constructed from 4140 heat treated steel with a 1/2 Inch drive for torque wrench (2)