Additional Product Information Blade - quick cut, cutting height 10-70mm,flap type - steel. The beauty of having a rear roller is that you can mow over the edge of your lawn without tipping the machine, as the rear roller acts as a stabiliser. When mowing in wet/damp conditions the Rotarola collection is not hindered due to the full width rear ejection channel. This Rotarola can also be used without the catcher as the flap allows grass to be discharged to the rear.