Excel Abrasives offers Diamond Files in Seven Shapes. Excel Abrasives supplies industrial diamond products. Diamond Files in Seven Shapes have a uniform distribution and high concentration of diamond particles permitting rapid reduction of stock. Diamond Files in Seven Shapes is suitable for alloys, steels, tungsten carbide, hardened steel, glass, fiber glass, marble and many other hard materials. Great for die mould, saw blades, cutting tools, carbide insert and anywhere premium grinding and sharpening is needed. These are available in seven shapes and standard sizes to choose from. The grits are available, course, medium and fine.