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Made of steel, these spanners are used to tighten or loosen nuts. The following types exist:
- Combined or star spanner: one end is star-shaped, allowing for great pressure to be exerted on the screw, since it covers all of its sides.
- Double elbow spanner: facilitating access to nuts in difficult places.
- Flat star spanner: spanners that take up little space and which are very manageable.
- Hexagonal tube spanner: used to loosen nuts which are in deep or hidden spots. They should always be supported by the fixed flat spanner.