Armstrong Drive Socket, Deep Length, Measurement System Imperial, 1/2 in Drive, Square Drive, 12 Point Socket, 11/16 in Socket, 3.23 in Overall Length, 0.956 in Drive End Width, 0.956 in Socket End Width, 0.65 in Bolt Clearance Depth, 1.342 in Opening Depth, Ball Locking, High Alloy Steel, Chrome Plated