Kids' building materials

Many places I've been trying to look for a child just the right tools. Now I do not mean that I would have the 50-pound machine acquiring, when itself only weighs around twenty pounds. But it would be probably more fun to kids tools to build something I really was. And not just play in a plastic toys, which does not really do anything. Our junior is at least pretty than happy when you get hold of a screwdriver and can be reached to dismantle some old toys. So why could be 4-5 years of suitable size hammers and cordless drill machines. Then they would build even small walls and small houses.