"The Real Avid Armorer's Master Wrench contains multiple tools for working on AR-type rifles, all in one easy to carry unit. The ergonomic handle provides the ability to apply serious torque needed to remove stubborn, crusted-on barrel or castle nuts without marring your firearm or stripping the nuts. The torque wrench attachment point allows you to apply accurate and critical torque adjustments. The Armorer's Master Wrench also provides a fully-functional, customizable armorer's hammer. Manufacturer model #: AVAR15AMW. Multiple tools for working on AR rifles Torque wrench attachment point Fully-functional armorer's hammer Ergonomic handle Tools include: Castle nut wrench 1/2"" torque receiver Fixed steel hammer head Brass hammer head Nylon hammer head Rubber hammer head 3/4"" muzzle brake wrench Mil spec barrel nut wrench Laser-etched torque specs Free-float barrel nut wrench 5/8"" receiver extension wrench"