Unknown 30x173 Dummy(?)

I have this 30x173 dummy…but I’m not sure what its intended use is.
Is it a drill or a tool cartridge?
The body is made of blue plastic, the bottom and the tip are made of steel.
On the body the number “1305 99-439-606” is stenciled, the number “99” indicates Great Britain.
Zuschneiden_17_Bildgr%C3%B6%C3%9Fe%20%C3%A4ndern
Zuschneiden_18_Bildgr%C3%B6%C3%9Fe%20%C3%A4ndern

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