Wheelers Delta Series Professional Armorers Wrench is designed to be the last wrench youll need for building your perfect rifle. This tool is what every gunsmith or armorer needs to be able to build or repair their AR-15. Its constructed from the highest quality materials delivering you the best performance for all your gunsmithing needs at a great value, and includes 6 different essential AR tools. The handle has torque measurements included on the handle for accuracy with every build. Features : Castle nut wrench "5/8" fixed stock receiver wrench" "1/2" torque wrench receiver, Milspec barrel nut wrench "3/4" muzzle brake wrench,