Specialized, precise-fitment armorer's crowfoot wrench, fits 1/2" receiver torque wrench head – Purposefully designed to fit castle nuts on pistol buffer tubes, where compact build doesn't allow for a standard wrench head – Titanium coated stainless steel to confidently apply desired torque while minimizing marring on gun parts – Tight tolerances for solid grip and no-slip tool control. Mfg: Real Avid