Features
Some features of hex keys are:
- The tool is simple, small and light.
- The contact surfaces of the screw or bolt are protected from external damage.
- There are six contact surfaces between bolt and driver.
- The tool can be used with a headless screw.
- The screw can be inserted into its hole using the key.
- Torque is constrained by the length and thickness of the key.
- Very small bolt heads can be accommodated.
- The tool can be manufactured very cheaply, so one is often included with products requiring end-user assembly.
- Either end of the tool can be used to take advantage of reach or torque.
- The tool is L-shaped
Read more about this topic: Hex Key
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