Routing depths precisely defined. Highly precise aluminium feeler roller, through which the routing depth in special aluminium composite materials is determined. The material thickness of the aluminium composite panels, appropriate for this feeler roller, is 3 mm. For determining the exact routing depth for aluminium composite panels|No ghost lines on the material due to special bearing. Routing depths are precisely defined|Sensor rollers can easily be replaced. exactly coordinated to the routers of the PF 1200. for aluminium composite milling machine for A3 aluminium composite panels