Real Avid Master Fit A2 Crowfoot Wrench Set 5 Pieces. This set includes 4 specialized crowfoot builder wrenches that fit the most common A2/AR15 assembly nut sizes and a heavy-duty 1/2 torque wrench. Wrenches are titanium coated stainless steel and include a storage rail. Master-Fit single purpose crowfoot wrenches are made specifically for the job. Specialized for precise fitment and manipulation of A2 barrel nuts buttstocks muzzle devices and castle nuts. Titanium coated stainless steel construction provide tight tolerances for solid nut-gripping strength and enhanced no-slip fitment. Paired with the heavy-duty Master-Fit Torque Wrench it takes Gun DIY building to a new level of Master Grade quality and precision. Specifications for Real Avid Master Fit A2 Crowfoot Wrench Set: Manufacturer: Real Avid Fabric/Material: Stainless Steel Color: Stainless Finish: Titanium Gun Model: AR-15 Condition: New Features of Real Avid Master Fit A2 Crowfoot Wrench Set Master-fit torque wrench Delta ring / free-float barrel nut wrench 3/4? muzzle device wrench 5/8? muzzle device / a2 buttstock extension tube wrench Extended & standard castle nut wrench Storage strip Package Contents: Real Avid Master Fit A2 Crowfoot Wrench Set What firearm models does the manufacturer say Real Avid Master Fit A2 Crowfoot Wrench Set is compatible with? The manufacturer suggests that Real Avid Master Fit A2 Crowfoot Wrench Set is compatible with AR-15Real Avid AVMF5WS: Master Fit A2 Crowfoot Wrench Set 5 Pieces