Clue | Source | Date |
---|---|---|
Cover for an exposed bolt end | ||
Domed top for a threaded fastener | The Washington Post | 25 Apr 2021 |
Domed top for a threaded fastener | LA Times Daily | 25 Apr 2021 |
Hemispherical fastener | ||
Bit of plumbing hardware | ||
Hemispherical fastener | ||
Screw backer |