Olson Scroll Saw Files convert your scroll saw into a power sander! Use these fine grit scroll saw files for smoothing, sanding, shaping and correcting lines in non-metallic materials. They have a tempered spring steel core coated with silicon carbide abrasive. They can shape and sand hard and softwood, plaster, greenware, soapstone and non-ferrous metals including copper and brass. Olson Scroll Saw Files easily shape and sand complex contours and forms eliminating hand sanding. They work in most scroll saws taking 5" Pin End blades. They can also be used in pin vises, craft knife handles, mini hack, jeweler and hand fret saws. These measure.156" wide x.056" thick.