Olfa 25mm blades are the largest blades used in Olfa brand utility knives, designed for the heaviest cutting tasks. These blades are more than twice the size of the standard 9mm blades and are ideal for cutting thick materials such as foam, rubber, and insulation.

The 25mm blades are available in several types, including standard-duty, heavy-duty, and specialty blades for various applications. The larger size of the 25mm blades provides increased cutting surface area, greater strength, and improved stability when cutting through thick materials.

As with all Olfa blades, it's important to use the appropriate blade for the material being cut to ensure optimal performance and safety.