Rongzun International Holdings Group Ltd, formerly B & D Strategic Holdings Ltd, is an investment holding company principally engaged in alteration and addition works and civil engineering works. The Company operates its business through two segments. The Alteration and Addition Works segment mainly contracts works including new structural works, fitting out works, changes in facilities configuration, constructing new extensions to existing buildings, conversions of an existing building to different types, fabrications, modifications, removals, or installations of hardware and equipment; erections, relocations, or removals of partitions, doors, and windows; changes in type of finishes and flooring materials. The Civil Engineering Works segment generally contracts works including site formation and foundation works.