The Wheeler Crowfoot Wrenches are professional-grade, hardened steel wrenches specifically crafted to stand up to the rigors of AR-15/LR308 assembly, maintenance, and modification; allowing you to tackle any AR building or maintenance task. Each wrench is purposely-built with precision to exact fitment allowing you to install handguards, muzzle devices, and barrels with confidence. FeaturesInnovative dual-ended wrench design performs multiple functions per wrench?Compatible with XL F.A.T. wrench or any other A 1/2'' drive torque wrenches?Professional-grade, hardened steel construction withstands extreme use & resists bending?Black oxide finish prevents rust and corrosion while extending the life of the wrench?