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Flap discs are essential grinding tools used daily by metalworkers and industrial technicians. They deliver high grinding efficiency, are easy to control, and come in multiple grit options to suit different finishing needs. But many users still wonder :What do the grit numbers mean? Which grit should I choose for my project? Will the wrong grit leave scratches or ruin the surface? This article explains everything you need to know about flap disc grit levels from coarse to fine plus how to choose the correct one for your specific task.