Replacement blades are sharp cutting tools designed to fit specific devices, such as razors, box cutters, or utility knives. They are essential for maintaining the performance and safety of these tools, ensuring clean and efficient cuts. These blades come in various sizes and materials, including stainless steel and carbon steel, to suit different applications. Regularly replacing dull blades helps prevent accidents and improves the quality of work, making them a vital component for both professional and DIY projects.