The SupaTool Retractable Snap off knife is useful for any situation when working in the office, especially when cutting through boxes or other packaging. It is supplied with an 25 mm Blade which can be easily replaced when the blade has become dull or snapped after heavy use of the knife. This blade is constructed from metal making it very strong and suitable for heavy-duty purposes. The blade is protected with rubber grips around the handle for safety and ease of use. Be sure to use with caution as the blade provided is extremely sharp and could cause injury if misused. 2 Year Guarantee!