The specifications usually refer to the dimensions of combination-lock filing cabinets with doors. These cabinets are categorized by the number of doors; common specifications for two- or three-door models are 900 x 420/500 x 1850 mm, while other even-numbered door configurations typically measure 900 x 400 x 1900 mm.
Common specifications for steel combination-lock filing cabinets include 1800 mm (H) x 850 mm (W) x 390 mm (D) or 1800 mm (H) x 900 mm (W) x 400 mm (D). However, as these dimensions depend on the standard cabinet designs of individual manufacturers, you should refer to the specific manufacturer's specifications.