This OLFA® Endurance Rotary Blade cuts two times as long as standard OLFA rotary blades. The expertly-honed tungsten tool steel blade with proprietary metal chemistry is designedto cut twice as long to extend time between blade changes, saving you time and money! The replacement blade fits any OLFA® 45 mm rotary cutter. RB45H-1 contains 1 blade in a plastic case, blister packed.