This Meccano Erector Motorized Special Edition Crane Building Set Kit Case #7080 is a great toy for children aged 8+. The set includes a gear building set with metal materials and a construction vehicle.

I did not count the pieces I did verify you have all the main components to make it run.  I also had another Erector set I thru in to make sure you did not end up missing a few bolts once you put it together.