Fiskars Easy Change Ergo Control Rotary Cutter has an ergonomically sculpted Softgrip handle to reduces hand fatigue and a magnetic blade change system makes replacing a blade quicker, easier and safer. The blade guard automatically extends when you release the handle for safety and the thumb-activated lock secures the rotary blade in either position for convenience during extended use and storage. The blade features a titanium coating that is 3x harder than steel for improved durability and lasting sharpness. Uses 45 mm replacement rotary blades.