Armstrong Drive Socket, Standard Length, Measurement System Metric, 3/8 in Drive, Square Drive, 12 Point Socket, 7 mm Socket, 0.937 in Overall Length, 0.657 in Drive End Width, 0.413 in Socket End Width, 0.169 in Bolt Clearance Depth, 0.165 in Opening Depth, Ball Locking, High Alloy Steel, Chrome Plated