Image Item No. Description  4263  Technic, Plate 1 x 4 with Toothed Ends Catalog: Parts: Technic, Plate  2711  Technic, Plate 1 x 5 with Toothed Ends, 2 Studs and Center Axle Hole Catalog: Parts: Technic, Plate  4262  Technic, Plate 1 x 6 with Toothed Ends Catalog: Parts: Technic, Plate  2712  Technic, Plate Rotor 3 Blade with Toothed Ends and 3 Studs (Propeller) Catalog: Parts: Technic, Plate