SA AO 521 UTZ 2 x 1/4 x 1/4 IN WL The soft, conformable density of the Standard Abrasives Aluminum Oxide Unitized Wheel 500 Series makes it a good match for light-pressure cleaning, blending and finishing on flat or contoured partsWhen strict dimension tolerances are required, these non-woven abrasive wheels offer operators the finesse needed to deliver precise results. Product Information Brand 3M Part # 7000046891 Origin Country USA Product InformationCenter hole wheel attaches to tool with a unitized wheel mandrel (sold separately)Cuts faster than Standard Abrasives Buff and Blend non-woven products, though with less flexibilityOpen web is load resistant, contributing to longer abrasive service lifeRuns clockwise and counterclockwise, allowing greater flexibility and versatility when paired with tools and machinesSoft density offers exceptional conformability which is especially important for applications with close tolerancesSoft density wheel blends surfaces to a smooth finish