CRESCENT® Socket, System of Measurement: Metric, Hex Tip, 1/2 in Drive, 21 mm Socket, Standard Length, 1-1/2 in Overall Length, 0.8 in Opening Depth, 1.17 in Drive End Width, 1.17 in Socket End Width, 12 Points, 0.696 in Bolt Clearance, Alloy Steel, Finish: Full Polished Chrome