Spiked roller or perforating roller, is a typical and immensely useful tool for removing paper-based wallpapers. It is used in conjunction with, or prior to, the wallpaper spatula to ensure that soapy water can permeate the wallpaper layers more easily so that removing the wallpaper becomes less of an effort. The wallpaper perforator also gives you better access to the sublayers of painted-over or sealed wallpapers.