A series of tool cabinets made from sheet steel. The internal space can be divided using different sized plastic cases, which may also be sub-divided into smaller containers. The cases can be removed for use outside the cabinet or fixed into place into the detachable side moulding of the cabinet. The cabinets can be securely locked. By adding a worktop the robust construction of the cabinet body can be used as a work surface. It is possible to fit four swivel casters to make the cabinets mobile.