Tacfires combo wrench serves both the 5.56 and .308 AR platforms in one easy to use tool. This wrench aids in the assembly tightening or removal of barrel nuts muzzle brakes barrel extensions castle nuts delta ring assemblies and hex boltsscrews. Uniquely designed it offers extreme versatility as it features the ability to build service and maintain both your 5.56 AR15 and .308 AR10 rifles. The wrench includes the following features .2235.56 Barrel nut 1 16 NSR barrel nut .2235.56 Free float barrel nut .308 Free Float barrel Nut 34 Muzzle brake .2235.56 Barrel extension .308 Barrel extension Castle nut wrench AR15 Delta ring assembly removal tool 14 Hex 716 Hex 14 Driver and 12 Driver.