Domestic appliance or commercial appliance for cleaning, storing or cooking items, comprising a housing formed by walls, by means of which an interior is spatially surrounded, and at least one support device which is removable from the interior, • the support device comprising at least one rail system having at least two rails (136 and 138) which are connected to one another and movable relative to one another, and at least one support element, • when the support device is present in an installed state, the rail system being mounted on the housing in a force-transmitting manner in such a way that the support element is movable relative to the housing by pulling out the rail system, • it being possible to transfer a locking unit arranged on the support device and comprising at least one locking element between a blocking state and a free state, • when the support device is present in its removed state, in which the support device is physically separated from the housing, the locking unit being present in its blocking state, in which by forming a form-fit the locking element blocks the rail system from being pulled out, and • when the support device is present in its installed state, the locking unit being present in its free state, in which the locking element allows the rail system to be pulled out, • and the locking unit comprising at least one second locking element which is rotatably arranged on the support device, the locking elements (110, 150) being assigned at least indirectly to different rails (136, 138) of the rail system, characterised in that the blocking state of the locking unit is achievable by means of a plurality of blocking positions of the locking elements (110, 150), in which the elements are each rotated differently about their relevant axis of rotation (112, 152) relative to the support device, so that when the support device in its removed state is in a usage orientation in which the support element is provided for receiving an item, the locking elements (110, 150) are together in a first blocking position, and when the support device in its removed state is in a reverse orientation in which the support device is rotated by 180° relative to the usage orientation, the locking elements are in a second blocking position, so that when the support device is both in its usage orientation and in its reverse orientation, the locking unit is in its blocking state in each case. • the support device comprising at least one rail system having at least two rails (136 and 138) which are connected to one another and movable relative to one another, and at least one support element, • when the support device is present in an installed state, the rail system being mounted on the housing in a force-transmitting manner in such a way that the support element is movable relative to the housing by pulling out the rail system, • it being possible to transfer a locking unit arranged on the support device and comprising at least one locking element between a blocking state and a free state, • when the support device is present in its removed state, in which the support device is physically separated from the housing, the locking unit being present in its blocking state, in which by forming a form-fit the locking element blocks the rail system from being pulled out, and • when the support device is present in its installed state, the locking unit being present in its free state, in which the locking element allows the rail system to be pulled out, • and the locking unit comprising at least one second locking element which is rotatably arranged on the support device, the locking elements (110, 150) being assigned at least indirectly to different rails (136, 138) of the rail system, characterised in that the blocking state of the locking unit is achievable by means of a plurality of blocking positions of the locking elements (110, 150), in which the elements are each rotated differently about their relevant axis of rotation (112, 152) relative to the support device, so that when the support device in its removed state is in a usage orientation in which the support element is provided for receiving an item, the locking elements (110, 150) are together in a first blocking position, and when the support device in its removed state is in a reverse orientation in which the support device is rotated by 180° relative to the usage orientation, the locking elements are in a second blocking position, so that when the support device is both in its usage orientation and in its reverse orientation, the locking unit is in its blocking state in each case.