Single-sided high carbon steel razor blade, sharp and durable. The blade length is 4 inches (100 mm). Easy Blade Replacement: Push button makes it easy to unlock/attach the blade and quickly replace it. There is no need to use other tools.The handle of the glass scraper is made of non-slip rubber, ergonomic design, solid construction, good quality and comfortable to hold. The blade is firmly held in the channel reinforced by the handles. This scraper also features a protective snap-on cover for added safety when the scraper is not in use. All your specialty window scraping jobs, such as paint, tape, stickers and debris construction materials such as stucco or putty, can be quickly and efficiently removed from walls, windows, tiles and glass.