Armstrong Drive Socket, Deep Length, Measurement System Imperial, 1/2 in Drive, Square Drive, 12 Point Socket, 3/8 in Socket, 3.23 in Overall Length, 0.86 in Drive End Width, 0.57 in Socket End Width, 0.335 in Bolt Clearance Depth, 0.32 in Opening Depth, Ball Locking, High Alloy Steel, Chrome Plated