Hexagon Wrench (Allen Key)
A tool used to drive bolts and screws with hexagonal sockets in their heads.
- Common Sizes: Metric (e.g., 2mm–10mm) or Imperial (e.g., 1/16"–3/8")
- Materials: Chrome vanadium steel, often with a ball-end for angled access
- Uses: Bicycle assembly, furniture (e.g., IKEA), machinery, electronics
Note: Also known as Allen wrench or Allen key.