Diablo, 412, 80 Grit, XLock, Flap Disc, Steel Demon Grinding Polishing Flap Discs Grind Polish Simultaneously To Help Scale Down Smooth Out Metal Stainless Steel Surfaces, Featuring XLock, Can Be Changed Quickly Without The Use Of Tools, A Conical Shape 40 Grit Composition Combine For 10X Faster Material Removal, Designed To Be Backwards Compatible, These Discs Work With XLock Angle Grinders 78 Arbor Angle Grinders When Grinding Polishing Metal Materials