Standard Abrasives A/O Unitized Wheel 882140, 821 3 in x 1/2 in x 1/4 in, 10 per case The Standard Abrasives Aluminum Oxide 800 Series Unitized Wheel is a hard density wheel designed with extra tough edge durability, making it a good match for heavy-duty edge deburring and stainless steel polishing applications. Product Information Brand 3M Part # 7000046920 Origin Country USA Product Type Non-woven Wheels Product InformationAluminum oxide mineral is a good match for ferrous and non-ferrous metals, including aluminumCenter hole wheel comes in a range of diameters from 1-6? and attaches to tool with a unitized wheel mandrel (sold separately)Combining a high density wheel with medium or coarse mineral results in superior edgework deburring and polishingHarder material density and increased edge durability over 700 Series Unitized Wheels increases life for heavy-duty tasksOpen web is load resistant, contributing to longer abrasive service lifeRuns clockwise and counterclockwise, allowing greater versatility when paired with tools and machines