Crescent® Socket, Measurement System: Metric, Hex Drive, 1/2 in Drive, Deep Socket, 21 mm Socket, 3.27 in Overall Length, 1.4 in Opening Depth, 1.09 in Drive End Width, 1.09 in Socket End Width, 6 Points, Shoulder, 1.338 in Bolt Clearance Depth, Crestoloy® Alloy Steel, Polished Nickel/Polished Chrome

Crescent® is a premier hand tool brand from Apex Tool Group, one of the largest hand tool manufacturers in the world. The brand is often associated with its most famous product, the Crescent® brand adjustable wrench. Since its introduction in 1907, the Crescent® adjustable wrench has grown to be one of the most essential tools in the toolboxof generationsof professional tradesmen - well-known and well-regarded as an iconic hand tool that was proven and reliable.In fact, after his historic solo transatlantic flight in 1927, Charles Lindbergh was quoted saying he carried only "gasoline, sandwiches, a bottle of water and a Crescent® wrench and pliers".