This OLFA® Endurance Rotary Blade cuts TWO TIMES as long as our standard rotary blades. The expertly-honed tungsten tool steel blade with proprietary metal chemistry is designed to cut twice as long to extend time between blade changes, saving you time and money! The replacement blades fit any OLFA® 45mm or 60mm rotary cutter you already have. Blade retains its edge two times longer than standard OLFA® rotary blades. Made from high-quality tungsten tool steel. Fits any OLFA® 45 mm or 60mm rotary cutter.