The UTG AR-15/AR-308 Armorer Combo Wrench installs and removes the parts you swap most often on both the AR-15 and AR-308 platforms: a standard A2 flash hider, the delta ring assembly, a rifle-length buffer tube, a carbine buffer tube castle nut, and more. It is steel with a wear-resistant phosphate finish, and it accepts a 1/2" torque wrench, so you can hit torque specs instead of guessing. Features: UTG Pro super slim free-float barrel nut wrench Compatible with 1/2" torque wrenches 3/4", 7/8" and 3-prong slots for most muzzle devices and 3-prong flash hiders 5/8" slot and flathead screwdriver for rifle-length buffer tubes and fixed A2 stocks Carbine buffer tube castle nut and delta ring Steel construction, phosphate finish Check that your barrel nut, muzzle device and castle nut follow standard mil-spec patterns before you use this wrench on them. Support the upper in a vise block when you torque a barrel nut, and stake the castle nut after install.