The Ox Tools Heavy Duty Knife Blade is a general-purpose heavy-duty blade. It can be used with the OX Trade Heavy Duty Retractable Utility Knife. The heavy-duty blades are a versatile accessory that can be used for a variety of jobs including carpentry, home DIY jobs and home decorating jobs. Can be used by both trade professionals and home DIY users. The plastic dispenser means the blades can be safely stored in a tool case or workshop without the risk of injury. Supplied as a single pack of 100 in a plastic casing.