The WheelerA(R) XL F.A.T. WrenchA(R) with Complete Crowfoot Set is the ultimate kit for the in-home or professional gunsmith looking to build AR-15's and LR-308's with mil-spec or aftermarket components. The set includes the XL F.A.T. Wrench that adjusts from 10-150 ft-lbs., providing more than enough torque required to complete any AR-15/LR308 build function with precision and confidence. Whether you're attaching accessories, assembling upper and lower receivers, or performing routine maintenance, you can be confident that the XL F.A.T. Wrench Crowfoot Set will deliver consistent and accurate torque every single time. At the core of the kit are 5 multi-function crowfoot wrenches that perform 12 different tasks thanks to their innovative, dual-ended design. These professional-grade, hardened steel wrenches are specifically crafted to stand up to the rigors of AR-15/LR308 assembly, maintenance, and modification; empowering you to tackle any AR building task. All the contents are neatly organized and secured in a premium latching hard case. Set Includes: XL F.A.T. Wrench AR-15/AR-10/LR308 Mil-Spec Barrel Nut Crowfoot Wrench 5/8'' - 3/4'' Buffer Tube, Muzzle Device Crowfoot Wrench Castle Nut Crowfoot Wrench Latching, Hard-Sided Case