Fits all reciprocating saws; insert as you would a standard blade. Intended for jobs that require scraping everything from tough to soft materials. Uses include: Ceramic tile adhesive, thinset, vinyl composition tile, linoleum, tough glue, drywall mud, paint, rubber-back carpet, and wallpaper. Made from carbon steel. Blade can be sharpened with any conventional sharpener. Not intended for concrete demolition.