Weiler Wolverine coated flap wheel uses A/O aluminum oxide AO as the abrasive material, is measured using outside diameter (OD), with the OD being 2 in, has a diameter of 2 in2 in and comes with a brush width of 1.9 in. Weiler incorporates this A/O aluminum oxide AO material into the flap wheel forming a grit of 60. The flap wheel has a length of 1.85 in. 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 Weiler flap wheel can be run at a maximum speed of 25000 RPMs.