Each unit is provided with heavy duty corner strengthening pieces for added rigidity. All filing cabinets incorporate an anti-tilt mechanism, which allows only one drawer to be opened at a time, thus preventing the cabinets from toppling. Each drawer is designed to carry 30Kgs and is provided with full height sides and back cover thus forming a box construction for storage of stationary and filling pockets. Drawers with full height back cover will prevent the filing pockets from slipping off the suspension rails when fully height back cover will prevent the filing pockets from slipping off the suspension rails when fully loaded. For security reason the base of each unit is fully concealed. The body and drawer edges are formed in such a way as to prevent dust, dampness, etc., from easily entering the unit when drawers are closed.