Armstrong Drive Socket, Standard Length, Measurement System Imperial, 1/2 in Drive, Square Drive, 12 Point Socket, 3/4 in Socket, 2.562 in Overall Length, 0.94 in Drive End Width, 1.062 in Socket End Width, 1/2 in Bolt Clearance Depth, 0.531 in Opening Depth, Ball Locking, High Alloy Steel, Chrome Plated