I just found this in a pile of old tools, more or less related to plumbing.

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The edges are sharp. The ridges do not have the same size on both sides.

Does anyone know what this is and what it is for?

  • 4
    looks likes it would be good for mudding lathes/flooring with grooves to hold tile. is there grout residue?
    – dandavis
    Commented Sep 8, 2017 at 14:21
  • 1
    @dandavis: interesting. Unfortunately there is no residue on it. Just a little rust here and there.
    – Ratbert
    Commented Sep 8, 2017 at 18:09

1 Answer 1


This tool is used for spreading tile adhesive (or a mortar base). The large teeth are for floor tile and the small teeth are for wall tile. If kept clean, it will last a lifetime!

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