CRESCENT® Socket, System of Measurement: Metric, Hex Drive, 3/8 in Drive, 17 mm Socket, Deep Length, 2-1/2 in Overall Length, 1-1/4 in Opening Depth, 0.94 in Drive End Width, 0.94 in Socket End Width, 6 Points, 0.3 in Bolt Clearance, Alloy Steel, Finish: Full Polish Chrome