Mercer Industries 262024 Zirconia Flap Disc, High Density Type 27, 4-1/2"x 7/8" Grit 24, 10 Pack 4-1/2" x 7/8", Type 27 High Deensity Flap Discs for Angle Grinder, Max RPM 13,00 High quality zirconia grain features a resin on resin bond Strong poly/cotton backing to extend the life of the disc Cool cutting and resistant to heat and moisture Does the job of a grinding wheel and a fiber disc