Help me identify this chimney bolt / screw

I have just moved into a new home. 1930s terrace in SW London. A built-in wardrobe is around the shape of where the chimney breast would have been on the first floor. At the back of the wardrobe there are these bolts / screws / valves sticking out of the chimney breast. One is completely loose (photos attached, inc. the removed one). From the dust they appear to drill into the brickwork.

Any idea what they are? I’m hoping to have the wardrobe replaced, are these important?

Thanks!

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