Outstanding lifespan for grinding metal! Robust aluminum oxide grains for long-lasting performance. Do you need a strong and durable grinding cup for cleaning metal and cast iron surfaces or for sharpening your tools? The combination of premium quality grinding grains and strong bonding material gives the PRO Metal the strength you need to get the job done. The PRO Metal grinding cup is a durable accessory for metalworkers who need to grind metal and cast iron. The disc is highly efficient for cleaning surfaces or sharpening tools. The combination of high-quality aluminum oxide grinding grains and a strong resin bond ensures stability and durability. Use it for coarse grinding with your bench grinder at a maximum speed of 8,500 RPM for best results.