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3M coated 241E flap wheel uses aluminum oxide as the abrasive material and has a diameter of 6 in. 3M incorporates this aluminum oxide material into the flap wheel forming a grit of 220. 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 wheel can be run at a maximum speed of 6100 RPMs.