Armstrong Drive Socket, Standard Length, Measurement System Imperial, 3/4 in Drive, Square Drive, 12 Point Socket, 15/16 in Socket, 1.968 in Overall Length, 1.39 in Drive End Width, 1.39 in Socket End Width, 0.688 in Bolt Clearance Depth, 0.65 in Opening Depth, Ball Locking, High Alloy Steel, Chrome Plated