LBE Unlimited, Armorers Tool, For AR-15, 4140 Steel Construction, Black 4140 Steel Construction 5 in 1 Tool Design Features a 1/2" Torque Wrench and Bottle Opener Product Description The LBE AR-15 Armorers tool is made in the USA from heat treated 4140 steel. The wrench features aid in the installation and removal of castle nuts, 3/4" muzzle brakes, A2 receiver extensions, take down/pivot pins, standard barrel nuts and free float barrel nuts. Featuring a 1/2" torque wrench and a handy bottle opener, this Armorers wrench will be your go to tool for all your building needs.