<p>A grass cutting unit with a conventional cutter reel (56) has forward (34) and rear rollers (32) mounted on a common, pivotable, carriage (14). By adjustable pivoting of this carriage the height of cut can be adjusted whilst maintaining strict parallelism between the rollers. A knife or groomer roller (40) is cantilevered in front of the forward roller and is supported on the common roller carriage (14).</p>
