Quick-Change Sanding Disc, Abrasive Type Coated, Abrasive Material Zirconia Alumina, Backing Material Polyester, Backing Weight Y, Coating Coverage Semi-Open, Grade Extra Coarse, Grit 36, Overall Diameter 1 1/2 in, Quick Change System TS, Series BlueFire R860, Maximum Operating Speed 30,000 RPM, Color Blue, Package Quantity 100