Features: Premium abrasive cloth provides up to 15X longer life than fiber resin discs Zirconia grit 3X faster than fiber resin discs Type 29 fiberglass backing provides optimum (10º - 25º) grinding angle, allows full use of the disc and won't mar Includes: 1 disc SPECIFICATIONS DISC: Diameter: 5" Arbor: 7/8" Grit: Z120 MAX RPM: 12200