This 20" planer offers exceptional finish quality due to its style of construction. This machine is equipped standard with a mechanical readout for table positioning, and adjustable rollers in a cast iron table before and after the cutterhead. The S 520 series also has a steel sectional infeed roller to allow different thicknesses to be fed at same time, and 4 speed changes to allow for better finishes and different types of materials. The large maximum thickness capacity is really what sets this machine apart from other machines.