The engineers of the future can probably be spotted at play with kits just like this one! Using the spanner & screwdriver, shaped metal plates & special plastic pieces are bolted together to build a 140 piece bulldozer. This absorbing kit is one of several boxed sets that are interchangeable or can be combined to make larger models of a more unique design. The satisfaction of having completed the model successfully may even inspire youngsters with enquiring minds to go on to do greater things.