Seven Function Tool Lets You Build & Repair AR-15's Durable steel wrench gives you seven tools-in-one for maintenance, repair or building AR-15 and M16 rifles. Use to install or remove: free float tubes and peg-style barrel nuts, standard barrel nuts, carbine stock, compensator, extension tube and buttstock screw. Special features include 5⁄8" and ¾" wrench slots, a ½" square hole for a torque wrench, plus screwdriver tip for buttstock. SPECS: 4140 steel, black, parkerized finish. 12" (30cm) long, 1" (2.5cm) wide handle.