This OLFA Endurance rotary blade is a 60 mm replacement for cutters used on medium to heavy cutting tasks and longer straight runs. It includes one 60 mm (2.36 in) blade engineered to last longer between changes than standard OLFA rotary blades on fabric and thicker craft materials. Use the cutter's locking features during replacement and keep the blade protected in its packaging when not in use Use a sharp mat and steady pressure.