3M 3M 577F Type 29 Coated Alumina Zirconia Flap Disc - 40 Grit - 4 1/2 in Diameter - 7/8 in Center Hole - Standard - 30988 60440263469

3M coated 577F Type 29 flap disc uses alumina zirconia as the abrasive material and has a diameter of 4 1/2 in. 3M incorporates this alumina zirconia material into the flap disc forming a grit of 40. All abrasive products that rotate or spin, such as the ones in this category, have a maximum speed at which you can run them. This 3M flap disc can be run at a maximum speed of 13300 RPMs. The 3M flap disc uses fiberglass for the backing plate.