Designed for optimal performance in steel applications, these flap discs are crafted with high-quality zirconia grain and a durable poly/cotton backing that ensures both longevity and superior finishing strength. With a size of 4-1/2 x 7/8 inches and a grit rating of 80, they are ideal for achieving a smooth surface on various metal projects. Operating at a maximum RPM of 13,300, these Type 27 discs require high-output angle grinders to deliver the best results, making them a reliable choice for professionals in welding and metalworking. Each box contains ten discs, providing an efficient solution for heavy-duty tasks.