Abstract: Descaler head assembly having peripherally successive and longitudinally successive series of descaler elements (11, 12). The assembly is made up of a central support shaft (15) which is securely threaded through a series of mutually separate, rigid holding elements (10) for connecting elements (13, 14) of the descaler elements (11, 12) for rotation therewith, the connecting elements being fastened in pairs or groups to the holding elements (10). The connecting elements are each in the form of a relatively short piece of chain, piece of wire or similar flexible means and are connected to the holding elements at a considerable distance from the axis of rotation of the shaft. The position of the connecting elements relative to each other is determined by the angularly set positions of the holding elements and axially set positions on the support shaft (15).