These cyborg destroyers from Vinci miniatures are part of their Mechrat army from their Dark Future range.

These come with multiple options including:
3 different heads
3 different right arms
3 Different left arms
4 Different guns (which can be mounted on either shoulder)
2 different optional bulldozers
2 different engine pieces
Optional track guards

By default a single random head, right arm, left arm, engine piece and bulldozer and a pair of track guards will be supplied.

If buying the set of three, one of each head, one of each arm, one of each bulldozer, and a random mix of engine pieces will be supplied.