Shop Talk: Built for Stock Removal3M™ Cubitron™ II Hookit™ Film Sheet 775L is ideal for a broad range of applications focused primarily on stock removal and finishing, because the 3M Precision-Shaped Ceramic Grain quickly refines the surface of the workpiece. This sheet may be used on a wide variety of substrates, including metals, composites, gelcoat, and whitewood. For additional durability and edge retention, the film backing offers great tear resistance. Abrasive grain is adhered to the backing in an open-coat construction, which means the grains are spaced apart from each other. These spaces permit debris to escape, which can be especially helpful on work surfaces that tend to clog or load a coated abrasive.Engineered to Help You Do More3M precision-shaped grains have sharp peaks that easily "slice" through substrates. They stay cool, cut fast and last long. Conventional ceramic abrasive grain tends to "plow" through the metal, causing heat to build up in the workpiece and the abrasive — resulting in a slower cut, shorter abrasive life. This grain is engineered to deliver consistent results, part after part.