The Real Avid Master-Fit 5-Piece A2 Crowfoot Wrench Set is a purpose-built, specialized tool set designed to upgrade A2-style AR15s. This set includes four crowfoot builder wrenches and a heavy-duty 1/2" torque wrench that fit the most common A2/AR15 assembly nut sizes. The wrenches are made from titanium-coated stainless steel and come with a storage rail. The Real Avid Master-Fit 5-Piece A2 Crowfoot Wrench Set is a specialized tool set designed to A2-style AR15s. The set includes 4 crowfoot builder wrenches and a heavy-duty 1/2" torque wrench that fit the most common A2-style AR15 assembly nut sizes. The wrenches are made from titanium-coated stainless steel, providing tight tolerances for solid gripping strength and enhanced no-slip fitment. This set is specialized for precise fitment and manipulation of A2 barrel nuts, buttstocks, muzzle devices and castle nuts, making it easy to confidently deliver torque when working on your delta ring, castle knot or muzzle device. The set includes 4 specialized wrenches for basic A2 components and Free-Float barrel nuts: 20 Hole & 4 Hole Free-Float Barrel Nut wrench, Extended & Standard castle nut wrench, 3/4" Muzzle device wrench, 5/8" Muzzle device wrench / A2 Buttstock extension Tube wrench. The wrenches can be affixed and stored on the included storage rail. The heavy-duty Master-Fit Torque Wrench boasts a 10 to 150 foot-pound range for various torque settings and requirements. With 45 ratcheting teeth, the driver clicks every 8 degrees, allowing for optimal placement and leverage positions. The dual-directional torque feature allows the wrench to set torque on reverse threads as well. This wrench features a 10 to 150 foot-pound range (Accurate readings to A 4%) and comes with a hard-sided storage case and 1/2" drive rail holder to secure and organize crowfoot wrenches. The Real Avid Master-Fit 5-Piece A2 Crowfoot Wrench Set provides the capability to modify and build your A2-style AR15 with ease and precision. Upgrade to Real Avid's Master-Fit for Master Grade quality and precision when working on your A2-style AR15.