CRESCENT Socket, System of Measurement: Metric, Hex Drive, 3/8 in Drive, 18 mm Socket, Standard Length, 1 in Overall Length, 0.63 in Opening Depth, 0.95 in Drive End Width, 0.95 in Socket End Width, 12 Points, 0.606 in Bolt Clearance, Alloy Steel, Finish: Full Polish Chrome