Armstrong Drive Socket, Standard Length, Measurement System Metric, 3/8 in Drive, Square Drive, 6 Point Socket, 9 mm Socket, 0.937 in Overall Length, 0.657 in Drive End Width, 0.508 in Socket End Width, 0.22 in Bolt Clearance Depth, 0.201 in Opening Depth, Ball Locking, High Alloy Steel, Full Polished Chrome Plated