This is the 18" Monorail Cutter from Rotatrim . The baseboard is screen gridded in 10mm squares for accurate placement of the cutting material. The unit's guide rail prevents the cutting head from swiveling. There are also "A" size indicators and two additional metric/imperial scale bars. This trimmer is designed to withstand high volume applications. The Sheffield steel cutting blade will cleanly cut virtually all flexible materials up to 2.0mm in thickness.