3M Scotch-Brite non-woven PF-ZS flap wheel uses aluminum oxide as the abrasive material and has a diameter of 2 in. Since this product is non-woven, grade is generally used to describe the abrasiveness; with the 16622 having a medium grade. 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 12000 RPMs.
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