WKRET-MET – Universal Fixing Disc WKRET-MET – TDP-060 – Universal Fixing Disc are designed to be used with an appropriate fastener to fix insulation boards onto lightweight and masonry substrates. Properties Universal application for installing commonly-used insulation material in timber and steel sheets substrates Can be used with a wide range of screws for installing insulation materials of different thicknesses Minimizes thermal bridging and seals connections Box of 200 pieces Suitable for use with: Polystyrene foam Mineral wool Timber Steel sheet