Premium High Carbon Steel: Constructed of high quality carbon steel for extra durability and long life with HRC 58~64 hardness these scraper razor blades stay sharp longer compared to ordinary blades,Sharp Cutting Edge: WORKPRO single edge blades feature a sharp long-lasting edge delivering optimum cut performance. The steel backing provides a better feel and control great for general scraping and cutting,Universal Razor Blades: The razor blades are single-edged with a size 1.53-inch length 0.77-inch width and 0.009-inch thickness. These replacement blades are built to fit all standard razor blade scrapers and box cutters,Convenient Package: Each pack includes 100 scraper blades packed inside a transparent case for convenient blade storage or easy retail displays. All blades come individually wrapped and protected in a paper for added safety,Wide Application: These single edge razor blades are perfect for scraping and cutting projects such as removing, paint, labels, stickers and decals on tiles glass windows and doors or quickly opening packages