Which of the following statements correctly describes the use of Allen keys in fitting accessories?
Allen keys are used for tightening or loosening hex socket screws.
An Allen key (hex key) is a hexagonal bar bent into an L shape, sized to fit a matching hexagonal socket.
Its six flat faces seat inside the recessed hex socket of a cap screw or grub screw, giving good grip on all six sides for turning.
This lets it tighten or loosen socket-head screws where an ordinary spanner or screwdriver cannot reach the recessed head.
Square holes, slotted heads and plain round heads call for other drivers, not a hexagonal key.
Hence, the answer is Allen keys are used for tightening or loosening hex socket screws.
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