1 X Wallpaper Tool Kit with Knife, Smoother and Roller Wallpaper Tools This 3-piece set includes a 1-1/2" wide seam roller, an 8" plastic paper smoother (to chase air bubbles out) and a small utility knife with snap-off blades. Sold for applying borders, but it will work with any seams and air bubbles and cuts. You may still need one of those big wallpaper-paste brushes but we can't be expected to do everything for you, can we?