Our plastic plasterboard joint knives, available in 5-inch, 7-inch, and 9-inch widths, are lightweight and flexible tools ideal for applying and smoothing joint compound, adhesives, and filler on drywall or plaster surfaces. Made from durable, easy-to-clean plastic, they are perfect for covering seams, spreading putty, or scraping excess material. The smooth edge provides a clean finish, while the flexible body allows for contouring on uneven surfaces. These knives are ideal for quick patching jobs, finishing work, and use in damp conditions where metal blades may rust.