Armstrong Impact Socket, SAE Standard Length, 2-1/2 in Socket, 1-1/2 in Drive, Squared Drive, 4-1/8 in Overall Length, 6 Points, 3-3/4 in Drive End Width, 3-3/4 in Socket End Width, 1.766 in Bolt Clearance Depth, 1-3/4 in Opening Depth, High Alloy Steel, Black Oxide