These two scenery pieces represent vertical storage tanks or perhaps industrial processing towers.
The taller structure stands about 5-3/4 inches (145 mm) tall.
The smaller tank stands 4 inches (112 mm) in height. The bases of both measure about 2-3/4 x 2-3/8 inches (70 x 60 mm). Designed for use with 25 to 28 mm scale miniature gaming figures as shown in the pictures.
Scenery pieces like these are pretty versatile and can be used in many science fiction and super hero games. They can be used to expand an industrial complex such as a mining colony. They would fit in with any mad scientist's lair. Their small footprints allow them to be used in even small game boards.
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