Proto® TorquePlus™ Socket, Standard Length, No Impact Rated, Measurement System: Metric, Square Drive, 3/8 in Drive, 20 mm Socket, 30.1 mm Overall Length, 16 mm Opening Depth, 27.6 mm Drive End Width, 27.6 mm Socket End Width, Ball Locking, 12 Points, 12.6 mm Bolt Clearance Depth, Alloy Steel, Full Polished