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The Real Avid Master-Fit 5-Piece A2 Crowfoot Wrench Set is a purpose-built and specialized tool set for precise fitment and manipulation of A2-style AR15 barrel nuts, buttstocks, muzzle devices, and castle nuts. The set includes 4 crowfoot wrenches and a heavy-duty Master-Fit Torque Wrench, with titanium-coated stainless steel construction for enhanced no-slip fitment and solid gripping strength. The wrenches are organized and stored on the included storage rail and hard-sided storage case. Upgrade to Master-Fit for a new level of Master Grade® quality and precision in Gun DIY® building.