This is the Adepta Sororitas Penitent Engines kit for Warhammer 40,000.

This multipart plastic kit builds two Penitent Engines. These frenzied mechanical walkers combine berserk toughness and speed with brutal close range weaponry, rampaging forwards to mangle the enemies of the Ecclesiarchy. Each Penitent Engine is equipped with two heavy flamers, and any combination of two melee weapons chosen from penitent buzz-saws or penitent flails. Alternatively, each miniature can be built as a Mortifier.

The kit comprises 126 plastic components, and is supplied with 2x Citadel 50mm Round Bases. These miniatures are supplied unpainted and require assembly