Armstrong Drive Socket, Standard Length, Measurement System Metric, 3/4 in Drive, Square Drive, 12 Point Socket, 23 mm Socket, 1.969 in Overall Length, 1.39 in Drive End Width, 1.39 in Socket End Width, 0.689 in Bolt Clearance Depth, 0.598 in Opening Depth, Ball Locking, High Alloy Steel, Full Polished Chrome Plated