Makes light work when loading your roof rack and also helps to protect the upper area of the van from accidental knocks from ladders etc. High quality stainless steel full width 'Rear Loading Roller' mounted on pre galvanized steel channels attached to the rear bar of your roof rack to provide maximum rigidity. The channels are slotted to provide some adjustment of the roller position. The roller is running in nylon bearings for a smooth rotation. They are supplied come with the correct roller length for your roof bars, if ordered at the same time. All fittings are included. Fitting time approximately 5 minutes.