This set offers the ultimate combination of sharpening stone and file. Features a 100% diamond abrasives that will put a razor-sharp edge on any alloy knife, even tungsten carbide tools. Tackles even the toughest filing jobs: ceramic tile, hardened steel, glass, concrete and more. Files on both pushing and pulling strokes to do more with less work. Three 100% diamond abrasive pads are available-coarse, medium, and ultrafine-which interchange quickly and easily on the DualTrak MagneLok magnetic holder. Engineered and assembled in the USA.