Heavy-duty wrench provides leverage for installing and removing AR barrel nuts. Vism Pro Series Gunsmith AR15/M16 barrel wrench is deigned to remove and install USGI barrel nuts with ease. This Armorer’s AR-15/M16 model wrench makes assembling barrels and free float handguards a snap. The other end of the wrench is for installing/removing 5/8" muzzle brakes and AR 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. Solid Steel Construction Length: 12.5" Weight: 23 oz. US Patent Pending. Vism limited one year warranty.