Mantle lifting device (10) has a body (26) configured to selectively engage and disengage an opening (24) of a mantle (12) by rotation in respective opposite directions about a central axis (28) of the body (26). The body (26) is provided with a lifting point (30) which is configured to couple with a lifting device such as a crane (not shown). The body (26) is in the general form of a plug having an upper surface (34) and an opposite surface (36) and tapered circumferential surfaces (38 and 40). The surface (40) is provided with indicia (43) commencing at a distance d on the surface (40) below the edge (42). This is used to indicate safe or unsafe lifting conditions. The indicia (43) being visible when the device (10) is engaged with the mantle (12) is an indication that the mantle (12) is worn to the extent that it may not be safe to lift the mantle (12) by way of the device (10), or at least not without additional safety precautions being taken.