Flap discs are abrasive tools used for grinding, blending, and finishing surfaces. They consist of multiple layers of abrasive material, typically made from aluminum oxide or zirconia, attached to a backing plate. The design allows for efficient material removal while providing a smooth finish, making them suitable for various applications, including metalworking and woodworking. These discs come in different sizes and grits, allowing users to choose the right one for their specific task. They can be used with angle grinders and other power tools, making them versatile for both professional and DIY projects.