NcSTAR Pro Series AR Barrel Wrench Black. 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 Specifications for NcSTAR Pro Series AR Barrel Wrench: Manufacturer: NcSTAR Fabric/Material: Steel Color: Black Gun Model: AR-15 Length: 12.5 in Package Contents: NcSTAR Pro Series AR Barrel Wrench What firearm models does the manufacturer say NcSTAR Pro Series AR Barrel Wrench is compatible with? The manufacturer suggests that NcSTAR Pro Series AR Barrel Wrench is compatible with AR-15NcSTAR VTARW3: Pro Series AR Barrel Wrench Black