A rear-mounted mirror assembly for trucks, vans and the like, for providing rear viewing as the vehicle is being backed up, for example, into a truck loading dock area. Each pair of adjacent ones of said permanent magnets is arranged generally in one of a convex V-shaped configuration and a convex U-shaped configuration with respect to a rotor axis, and a substantially V-shaped recess portion is formed between adjacent poles in outer circumferential surface portions of the rotor core. The lever journals are connected with a support body between the finish mill rolls of the rolling line and which has a centering funnel for the rolled wire or rod between the double arm levers.