A hex key, also known as an Allen wrench, is a tool of hexagonal cross-section used to drive bolts and screws that have a hexagonal socket in the head.
![5/16" Hex Keys Alloy 6150 Long Arm (Import) (200/Bulk Pkg.) 5/16" Hex Keys Alloy 6150 Long Arm (Import) (200/Bulk Pkg.)](https://cdn11.bigcommerce.com/s-gdy1ehz/images/stencil/500x659/products/108124/110470/512__58478.1420838244.png?c=2)
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