This rotary trimmer is 14", making it ideal for most cutting needs. The blade on this unit is hidden under the plastic housing to make it safer, and it self sharpens. The blade is also designed to cut in either direction so you can choose the way that works best for you. This high capacity tool is designed to cut up to 30 pages at once and the paper clamp is clear to allow you to see your lines. The grid on the unit will help you line up your paper perfectly and the backstop can be applied to either side to keep the unit more secure when you are using it.