Nylon fixing wallplug provided with hardboard screw in zinc and chromium-plated steel. Nylon wallplug provided with a flathead, cross-slotted type hardboard screw in zinc and chromium-plated steel for fixing Mapetherm Ba 4. Drill the substrate after positioning Mapetherm Ba 4, insert the Mapetherm FIX B nylon support by hammering it until the rim is in contact with the base profile. Screw in the steel screw until Mapetherm Ba 4 is fixed.