This is a trimmer that's versatile enough for use at home, school and office. It will trim up to ten 12" sheets of standard 20 lb. bond copy paper at a time, as well as card stock, black core artist mat board, plastic sheets, acetate and more. The cutting rail holds paper firmly in place, while the carbide rotary blade ensures a precise, accurate cut. The sturdy metal base is calibrated and features preset measurements for common-sized items. Rulers and a cutting surface grid make it easy to trim materials. The cutting blade rests directly next to the cutting rail, so there's no guessing where the blade comes into contact with the materials you're trimming. It includes one straight blade. Replacements and other blade designs are available separately in the B-series. A replacement mat is also available.