Triangular, Square, Hexagon and Cross 4 screw heads Put on and take off...this toy is fun to spin when you twill. It will greatly help develop hand-eye coordination. 1 screw and 1 screw for each shape Available in a variety of colors. Size for 1 years and up (Bolt Head) Diameter: Approx. 2.0 inches (5 cm), Manufacturer: Eduko (Netherlands) Material: Plastic.