Drywall knives, paint scrapers, joint knives, taping knives, and putty knives are different types of tools that are used for various purposes in drywall installation and repair. Drywall knives are used to cut and trim drywall sheets to fit the wall or ceiling. Paint scrapers are used to remove old paint, wallpaper, or adhesive from the surface. Joint knives are used to apply and smooth joint compounds or spackles over the seams and holes in the drywall. Taping knives are used to apply and press drywall tape over the joint compound or spackle to reinforce the seams and prevent cracking. Putty knives are used to apply and shape putty or filler over small holes or dents in drywall or wood. These tools can have different sizes, shapes, and materials depending on the preference and needs of the user. Some common materials are stainless steel, carbon steel, and plastic. Some common sizes are 4-inch, 6-inch, 8-inch, 10-inch, and 12-inch. Some common shapes are flexible, stiff, curved, straight, pointed, and square.