The Ox Tools Heavy Duty Knife Blade is a general-purpose heavy-duty blade that are extra flexible and durable for a longer-lasting 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 decorating jobs. Additionally, these high-quality blades can be used by trade professionals. The plastic casing means the blades can be safely stored in a tool case or workshop without the risk of injury. These blades are supplied as a single pack of 10 in a plastic casing.