Planer – thicknesser is a woodworking machine to trim boards to a consistent thickness throughout their length and flat on both surfaces. A thickness planer consists of three elements: a cutter head which contains the cutting knives; a set of rollers which draw the board through the machine; and a table which is adjustable relative to the cutter head to control the resultant thickness of the board. Some portable thickness planers differ slightly in that the table is fixed and the cutter head/feed roller assembly is adjusted. Industrial thickness planers are capable of accepting very wide boards and removing large amounts of material in a single pass.