Armstrong Drive Socket, Standard Length, Measurement System Metric, 3/4 in Drive, Square Drive, 12 Point Socket, 27 mm Socket, 2.094 in Overall Length, 1.539 in Drive End Width, 1.539 in Socket End Width, 0.752 in Bolt Clearance Depth, 0.701 in Opening Depth, Ball Locking, High Alloy Steel, Full Polished Chrome Plated