The most popular Dennis machine the FT is an interchangeable cassette mower giving options to fit 12 different heads including scarifiers, verticutters, brushes, spikers and slitters as well as 5 or 9 blade cutter cassettes with 15 seconds changeover of cassettes. Available as 17″ (43cm), 20″ (51cm) and 24″ (61cm) widths.