This is a handy tool to stick in your bag when hitting the range or work bench.Use it to swap your barrel, install accessories, remove your silencer, tighten scope rings, and more! the fix multi-tool features a barrel nut wrench, t-25 torx 1/4" bit included, 1/4" hex, 3/4" hex, 3/8" drive, and 1/2" drive.