CRESCENT® Socket, System of Measurement: Metric, Hex Drive, 1/4 in Drive, 10 mm Socket, Standard Length, 0.88 in Overall Length, 1/2 in Opening Depth, 0.55 in Drive End Width, 0.55 in Socket End Width, 6 Points, 0.291 in Bolt Clearance, Alloy Steel, Finish: Full Polish Chrome