The Master-Fit 2″ Spanner Wrench is purpose built and specialized for precise fitment to confidently deliver torque to free-float barrel nut locking ring. Titanium coated stainless steel construction provides tight tolerances for solid nut-gripping strength and enhanced no-slip tool control. When paired with the Master-Fit ½” Drive Torque Wrench, this Master Grade combo will take your gun building experience to a whole new level. The Master-Fit ½” Drive Crowfoot Wrenches also work with any standard ½” drive wrench.