7" x 5/8", T29, Flap Disc, Designed For Grinding Angles Of 20-25 Degree, Quickly Remove Material With Aggressive Grinding Action, Featuring Zirconia Grit, Which Removes Material 3X Faster Than Fiber Resin Metal Sanding Discs, Each Disc Is Packed With A Premium Abrasive Cloth That Lasts 15X Longer Than Fiber Resin Metal Sanding Discs.