Radiused nose designed to stay on the row. Micro notches along blade side let you 'feel' the cutting action. Easy to handle non-slip handle. The Magnum Row-Glide Top Cutter is a patented design for hassle-free top cutting of most loop and cut-pile carpets, keeping you on row to success. Row finding action parts easily through most of today's carpets. Unique micro-notches let you feel the cut as you advance. Innovative arched underside keeps nose on row as you cut. Does not come with blade. You can use and square or rounded edge carpet blades