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What is an Allen Wrench? What is a Hex wrench? Here's a definition.

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Park Tools Hex Wrench Set

This set of Park Tools hex wrenches includes sizes from 2-8 millimeters, very common for bikes.

Definition: A hex wrench, or Allen wrench, is a common tool for cyclists. It is six-sided, L-shaped wrench, whose ends fit inside bolts and screws that have a hexagonal opening in the head. Many, if not most current bicycles on the market use these types of bolts and screws almost exclusively as their fasteners.
Also Known As: Hex wrench, Allen wrench, hex key, Allen key
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