On the right-hand edge of paper cutter is a long, curved steel blade, often referred to as a knife, attached to the base at one corner. Larger versions have a strong compression coil spring as part of the attachment mechanism that pulls the knife against the stationary edge as the knife is drawn down to cut the paper. The blade on a paper cutter is made of steel which makes it almost impossible to break. The portable paper trimmer replacement blade fits all 20 inch paper trimmer machine. This unique blade results in more accurate, precise cutting. The ergonomic, high profile cutting carriage of blade allows for easier grasp of the blade when cutting. Package content:- 1x replacement blade for guillotine stack paper cutter.