Armstrong Impact Socket, SAE Standard Length, 13/16 in Socket, 1/2 in Drive, Squared Drive, 1-1/2 in Overall Length, 8 Points, 1-3/8 in Drive End Width, 1-3/8 in Socket End Width, 0.609 in Bolt Clearance Depth, 1/2 in Opening Depth, High Alloy Steel, Black Oxide