Marbrerie Crombé and Carrières de Maffle are 2 companies run by the Crombé family, which has been active in natural stone processing for more than 125 years. The workshops in Brussels and Ath saw and process natural stone (marble, granite, natural stone and composite in the stone sawmill, Belgian bluestone and French bluestone in the stonemasonry workshop) mainly for new construction projects, but also for renovation and restoration projects. In the workshops, the marble workers and stonemasons refurbish old stonework, including marble fireplaces, restore molded bluestone and reproduce old stonework after the original example. Their installers are experienced in facade restoration. The companies are regularly called upon to repair cracked balconies or stairs.

Cuttings and other residual products are recovered for use as pavers, broken stones, or small floor slabs, and their services may also be called upon for sawing or refinishing materials recovered elsewhere.