Abstract: A container type structure for providing a radio frequency shield is described having an integral latching means for securing a cover on the container, which latching means can readily be operated to allow the cover to be removed. The latching means are formed from a tongue-like member extending substantially parallel of the surfaces of the side walls of the container and resiliently biased in a direction for engagement with appropriate apertures or receptacles on the cover. Slots are provided through which the latch can be manipulated to allow ready removal of the cover.