CRESCENT® Socket, System of Measurement: Metric, Hex Tip, 1/2 in Drive, 21 mm Socket, Deep Length, 3.27 in Overall Length, 1.4 in Opening Depth, 1.09 in Drive End Width, 1.09 in Socket End Width, 6 Points, 1.338 in Bolt Clearance, Alloy Steel, Finish: Full Polished Chrome