Flap discs are versatile abrasive tools used extensively in metalworking, woodworking, and fabrication industries for grinding, blending, finishing, and polishing tasks. They consist of multiple overlapping flaps of abrasive material bonded to a central hub, typically made of fiberglass, plastic, or metal. These discs are mounted on angle grinders or die grinders and rotate at high speeds to perform various abrasive operations on surfaces and edges.