Installation is easy: Simply discharge EasyBlade Plus cartridge and insert a new one.Iindication window on blade cartridge changes from green to red when it's time to change blade.Ideal for trimming paper, presentations, photos and more.Blade Type: Rotary Trimmer; Cutting Edge Form: Straight; Material(s): Steel; For Use With: SmartCut Commercial Heavy-Duty 30-Sheet Rotary Trimmer (SWI-8912).