The Wheeler XL F.A.T. Wrench with Mil-Spec Crowfoot Set is a must-have for any DIY gun builder or professional gunsmith looking to build mil-spec AR-15s and LR308s. 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. At the core of the kit are 3 multi-function crowfoot wrenches that perform 8 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.