Pro Series AR15 Barrel Wrench - heavy duty purpose built barrel wrench Large heavy duty cross section makes it easier on the hands to work on your AR upper. You can remove/install GI barrel nuts with ease with this AR wrench. Makes for assembling/installing barrels and free float handguards a super easy task. The other end of the wrench is for installing/removing 5/8 muzzle brakes and flash suppressors. 1/2 and 3/8 drive compatible, for torquing your barrel nuts to the proper torque specifications. All the tools are Clearly Labeled. Hole at the end is for hanging tool on a wall peg, nail/screw. Steel Construction Length: 12.5 Weight: 23 oz. US Patent: D798121