Scotch-Brite™ durable flex belt is engineered to perform tough detail work such as deburring, blending and finishing, on a variety of metals. The reinforced, low stretch backing and superior edge durability aid in supplying an aggressive cutting ability. The non-woven fiber material runs cool, resists loading and holds up to edge work while aluminum oxide abrasives provide effective cutting action that produces consistent finishing performance over the life of the belt. All of our Scotch-Brite™ durable flex belts can be distinguished by their purple backing. This belt uses aluminum oxide abrasive. Aluminum oxide is a popular choice among industrial professionals because of its cut rate and long life. This mineral is a tough, durable abrasive that self-fractures to expose fresh cutting edges in use, whereas traditional abrasives, such as garnet, quickly wear down with use. Due to its high cut rate, hardness, strength and low heat retention, aluminum oxide mineral is widely used in grinding applications in addition to sanding and finishing use. Aluminum oxide is suitable on a wide variety of substrates in both woodworking and metalworking, including ferrous alloys. Belt sanders are used for rapid grinding, sanding and finishing on a variety of surfaces. Depending on the material being worked, sanding wheels and discs may clog, quickly making them less efficient, while belt sanders continue to sand without clogging because small grooves in the abrasive belt open as they go around the arc of the drive wheel. Scotch-Brite™ 7000121138, Backstand File Flex Low Stretch, 12 in Belt Length, 1/2 in Belt Width, Coarse Grade, Aluminum Oxide Abrasive, Brown, Applicable Materials: All Metals