The Breakthrough Clean TechnologiesA(R) Armorer's Wrench is the ultimate tool for your AR15/M4. Constructed out of durable titanium-plated stainless steel and includes a standard size muzzle device wrench. Easily installs and removes receiver extensions and castle nuts, functioning with both Mil-Spec and Pin-Style Barrel Nuts. Compatible with A 1/2" Socket / Torque wrench and comes with a bonus Butt Stock Screwdriver. Product Features: UNIVERSAL WRENCH: The Breakthrough Clean Technologies universal wrench is the ultimate tool for every day use. Constructed of durable Titanium plated stainless steel. EASY TO ADJUST: Includes standard size muzzle device wrench. Easily install & remove parts. Functions with both Mil-Spec & Pin-Style assembly. Compatible with Socket / Torque wrench.