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Could someone please help me find out what kind of tool this is?

The right arm is inscribed with (218 1/2)

1 Answer 1


Well it looks like a « 3 in 1 » to locate or align the holes in workpieces, then tap a thread and finally install a bolt with a square head.

Square head bolts tend to be for older things but not sure what industry that was designed for.

  • 1
    the square head is not much larger than the shank. I've seen bolts like that locking pulleys onto shafts.
    – Jasen
    Commented Jan 7, 2020 at 4:44
  • @Jasen yes, you are right - seen them as well, just could not remember last night...
    – Solar Mike
    Commented Jan 7, 2020 at 14:21
  • @Solar Mike Awesome! Could you maybe provide me with a link to such an item? (Or wikipedia article or something) I cant seem to find anything like it online... Commented Jan 7, 2020 at 18:03
  • @ProfessionalCode the tool or the bolt for the pulley? If it is the bolt then research flat belt pulleys.
    – Solar Mike
    Commented Jan 7, 2020 at 18:06
  • ebay.com/itm/…
    – Jasen
    Commented Jan 7, 2020 at 20:36

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