Armstrong Drive Socket, Standard Length, Measurement System Metric, 1/2 in Drive, Square Drive, 6 Point Socket, 11 mm Socket, 1.457 in Overall Length, 0.858 in Drive End Width, 0.709 in Socket End Width, 0.35 in Bolt Clearance Depth, 0.402 in Opening Depth, Ball Locking, High Alloy Steel, Chrome Plated