The Wooden Nut Screws Set is designed to promote a child's intelligence development and hand-eye coordination. It can help them to enhance their fine motor skills and exercise their hands as they learn how to tighten a screw. The activity also helps to cultivate parent child interaction. The set is made of natural Beechwood, containing no harmful substances, with smooth surface, no burr and edges, which are comfortable to touch. They are also sturdy and not easy to break.