A do-it-yourself screw building block set comes with 190 pieces in each box, offering a hands-on construction experience for children aged 3 to 6. The set includes blocks and screws that let kids assemble their own models, encouraging creativity and fine motor skills through simple screwing and connecting. Each piece is made of durable plastic, and the entire set is packaged in a convenient mail order box for easy distribution. This building set is sold wholesale by the box.