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.