NcStar's AR15 Armorer's Barrel Wrench is a generation 2 combo tool with many tools to work and upgrade your AR-15, M4, and M16. It features a barrel wrench for GI Barrel Nut, free-float barrel nuts with GI spacing, DD barrel nuts, and YHM ( 1 3/4") Spanner wrench, A2 (3/4") and 5/8 Flash Suppressor wrench, M4 collapsible stock castle nut wrench, A2 buffer tube wrench, a flat blade screw driver for A2 buttstock plate, 1/2" and 3/8" drive compatible, lower receiver push pin tool, and 1/4" hex bit drive socket, 1911 barrel bushing wrench, with a tactical bottle opener. All the tools are clearly labeled and is made of steel. Features: AR15 Armorer's barrel wrench - Generation 2 Combo tool with many new features/tools to work and upgrade your AR-15/M4/M16 Barrel wrench for GI barrel nut, free-float barrel nuts with GI spacing, DD barrel nuts, and YHM (1-3/4 inches) spanner wrench A2 (3/4 inches) and 5/8 inches flash suppressor wrench, M4 collapsible stock castle nut wrench, A2 buffer tube wrench Flat blade screw driver for A2 buttstock plate, 1/2 and 3/8 inches drive compatible, lower receiver push pin tool 1/4 inches hex bit drive socket, 1911 barrel bushing wrench, and a tactical bottle opener All the tools are clearly labeled