NEW R860 Flap discs replace R828 in sizes 100 - 125mm. Available to suit all angle grinders in diameters 100,115 and 125mm. For 180mm refer to R828. Flap discs are used for grinding stock removal and blending of steel fabrication welds. Flap discs comes in various grit sizes to achieve different types of finish on the work piece. Flaps feature Zirconia abrasive for fast stock removal.