CRESCENT® Socket, System of Measurement: Imperial, Hex Tip, 1/4 in Drive, 5/16 in Socket, Standard Length, 0.88 in Overall Length, 0.35 in Opening Depth, 0.46 in Drive End Width, 0.46 in Socket End Width, 6 Points, 0.2 in Bolt Clearance, Alloy Steel, Finish: Full Polished Chrome