Gearwrench Socket Extension, Pinless Universal, Series: X-Core, Yes Impact Rated, Metric, 6-Point Drive, 3/8 in Drive, 9 in OAL, Chrome Molybdenum Alloy Steel, Black Oxide.Compared to even the best pinned impacts, X-Core pinless impact tools deliver far greater durability and superior access. The exclusive 4-lug ball-and-socket design of these Gearwrench universal-joints, sockets and extensions provides the long-lasting strength and capability needed to take on the toughest automotive and industrial applications. When durability is key, the choice is clear, Gearwrench X-Core pinless.