Versatile Impact Wrench - with Lithium Ion technology Milwaukee has a compact 3/8 Impact Wrench powered by 12V Lithium Ion batteries. More power, longer run times, lighter weights and more compact footprints are achieved with Lithium Ion technology and Milwaukee tool design. This model features a built-in LED light to illuminate the workspace, variable speed for more control and a fuel gauge to let you know how much battery life is left. The 3/8 anvil model has a friction ring detent. It accepts impact rated sockets with the 3/8" square drive anvil for fast socket changes and each is equipped with overload motor protection. Imported.