Designed for high-performance applications, this 4-1/2" x 7/8" fiber disc is crafted from premium aluminum oxide with a specialized grinding aid, making it ideal for use on stainless steel, aluminum, and other metals. With a grit rating of 120, it excels in both grinding and blending tasks, ensuring efficient material removal while providing a superior finish. The disc features a closed coat structure that enhances its durability, while the vulcanized fiber backing ensures it can withstand heavy-duty sanding demands. Packaged in bulk spindle format, these discs remain perfectly flat for consistent performance, allowing for easy access and re-tightening as needed. With a maximum RPM of 13,300, this product from United Abrasives is an essential tool for professionals seeking reliable and effective sanding solutions.