The Norton 77696090086 Flap Disc is designed for efficient stock removal and surface finishing. Measuring 4.5 inches in diameter with a 40-grit abrasive, it is perfect for grinding and blending on metal surfaces, including stainless steel and carbon steel. The Type 27 design with a 5/8″-11 threaded arbor ensures quick attachment to angle grinders. This box includes 10 heavy-duty discs, providing excellent value for industrial applications.