Chromoly-steel wrenches accept standard torque wrench drives and help quickly assemble AR-15 rifles. Wrenches feature black phosphate finish for resistance to wear and corrosion, and Spikes Tactical logo. Castle Nut Wrench accepts 3/8" drive and has cutouts to fit onto standard AR-15 carbine buffer tube castle nut. USGI Barrel Nut Wrench accepts ½" drive. Features seven pins made of tool steel and TIG welded into place. Fits standard AR-15 barrel nuts. All wrenches sold separately.