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Product Description A hex key is an L-shaped tool used to drive bolts and screws that have a hexagonal socket in the head. Also known as an Allen key. Hex keys can be used to assemble bicycles, adjust seat height (on certain bikes) stem and handlebars, remove pedals, and more. From the Manufacturer A hex key is an L-shaped tool used to drive bolts and screws that have a hexagonal socket in the head. Also known as an Allen key. Hex keys can be used to assemble bicycles, adjust seat height (on certain bikes) stem and handlebars, remove pedals, and more.