Not 100 percent sure what this is used for.
Looks like it has been used for plaster or mortar.
Has aluminium shaft with 3 prong fork type head on one side and wedge type head on the other. Black and Red handle.
Shirley Tool Shed
https://shirleytoolshed.myturn.com/library/
33 Briggs Roadhttps://shirleytoolshed.myturn.com/library/
Mairehau
Christchurch, 8052
New Zealand
021 186 3645