Proto® TorquePlus™ Socket, Standard Length, Yes Impact Rated, Measurement System: Metric, Square Drive, 3/8 in Drive, 19 mm Socket, 27.8 mm Overall Length, 13.4 mm Opening Depth, 26.8 mm Drive End Width, 26.8 mm Socket End Width, Side Locking Hole Locking, 6 Points, 15.1 mm Bolt Clearance Depth, Alloy Steel, Black Oxide