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All answers having "Metal fastener" as clue:

3 Character Answers:

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PIN



4 Character Answers:

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HASP

NAIL

SNAP

TNUT



5 Character Answers:

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RIVET

SCREW

UBOLT



6 Character Answers:

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SETNUT

STAPLE

TRUDGE



7 Character Answers:

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EYEBOLT

STAPLER



9 Character Answers:

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COTTERPIN

SAFETYPIN

SOUWESTER