Fiber Disc, Disc Diameter 6 in, Mounting Hole Size 1/2 in, Abrasive Type Coated/Non-Woven Blend, Abrasive Material Aluminum Oxide, Abrasive Grit 100, Abrasive Grade Very Fine, Backing Weight Not Rated, Max. RPM 4, 000 RPM, Series HS-DC, Color Maroon, Vacuum Hole Design Non-Vacuum, Attachment Type 7/8 in Arbor Hole