An Allen wrench, Allen key, hex key or hex head wrench is a tool used to drive Allen screws and bolts, which have a hexagonal socket in the head. Many manufacturers have adopted hex key bolts for assembling bicycles or for self-assembly furniture. "Allen wrench" was originally a trademark of Allen Manufacturing Company in Hartford, Connecticut in 1943. Standard metric sizes: 1, 2, 3, 4, 5, 5.5, 6, 8, 10 mm. They were invented in 1964 by the Bondhus Corporation, but are manufactured by several ot

         

         

         

         

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