Homax Products Heavy Duty Yellow Plastic Drywall Corner Tool can be used for filling and applying drywall joint compound to inside corners of drywall installation. It is made of heavy-duty, high-impact polystyrene, making it both durable and lightweight. The beveled straight edges and molded 90-degree angle aid in applying joint compound, taping, or repairs of inside corners. This tool is easy to clean and comfortable to use, making it a great choice for both do-it-yourselfers and professional contractors.