Some Allen keys are sold on key rings, each key having a retaining spring.

Hexagon or Allen keys are only a few inches long. The hexagonal heads fit into small recesses in bolts or set-screw heads used in confined spaces. They are available separately or in 8 or 10-piece sets. Sizes generally range from 1.5-19mm. Long reach sets are available.

A hex key or Allen key (also known by various other synonyms) is a tool of hexagonal cross-section used to drive bolts and screws that have a hexagonal socket in the head (internal-wrenching hexagon drive).

The Allen name is a registered trademark, originated by the Allen Manufacturing Company of Hartford, Connecticut circa 1910, and currently owned by Apex Tool Group, LLC. Its genericized use is discouraged by this company. The standard generic name used in catalogs and published books and journals is "hex key".

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