Abstract: A roller track in a flat stock rolling mill facility includes rollers journalled in a frame having tranversely oriented stiffening traverses extending essentially axis parallel to the rollers, a sensing device for ascertaining absence and presence of rolled stock on the roller track, includes at least one open metallic loop mounted on a traverse in-between two rollers of the track, in a plane extending parallel to a plane of transport but below that plane and being electrically insulated from said traverse; an electric circuit is connected to the loop so that different impedance conditions of the loop are indicative of absence and presence of rolling stock in and on the roller track.