GearWrench X-Core Socket, Impact Rated, Imperial, Hex Drive, 3/8 in Drive, Standard Socket, 9/16 in Socket, 2.197 in OAL, 0.504 in Opening Depth, 0.988 in Drive End Width, 0.835 in Socket End Width, 6 Points, Pinless Universal Style, 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 four 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.