Abstract: As shown in the figures, the device of the present invention is a hand held and hand operated cutting blade connectively attached to the bottom end of a pole that is housed in and partially contained within a capped cylindrical tube wherein there are tracks installed to guide the cutting blade up and down within the tube, and there are two openings (slots or channels) on the sidewall of the cylindrical tube which are used to be fitted over the sides of a box at the corner. As the tube is lowered to the bottom of the box, the blade will slide up into the tube and come to a rest positioned at the top of the corner of the box. The pole with blade can then be easily pushed down through the corner of the box cutting it from top to bottom.