Riwin Holdings Limited (formerly known as Chengzhi Holdings Co., Ltd.) is an investment holding company mainly engaged in construction business in Hong Kong. The company operates through four divisions. The general building engineering and related services division mainly includes the development of superstructure, reconstruction and addition works. The Foundation and site formation Division includes piling, excavation and lateral support works, pile cap construction and land investigation works. Other building works divisions include slope works and demolition works. The construction-related consultancy services division includes the provision of engineering consultancy advice, engineering supervision and construction contract management services on architectural design.