The 4.5-inch x 7/8-inch 40-grit aluminum flap disc from BLACK & DECKER is designed for aggressive grinding and finishing on metal surfaces. This high-performance disc features a durable aluminum oxide abrasive that ensures long-lasting use and efficient material removal. Ideal for use on stainless steel, mild steel, and other metals, it provides a smooth finish while minimizing heat buildup. The flap design allows for flexibility and adaptability to various contours and shapes, making it suitable for both flat and curved surfaces. This disc is compatible with standard angle grinders and meets ANSI standards for safety and performance.