Design, build and repeat with the 34604 Builder Activity Set. The 201-piece set is a great construction toy for young engineers and contains everything you’ll need to build almost anything the mind can design. Use the screwdriver, hammer, wrench, cogs, gears, nuts, bolts and more to build your creations. The open-ended construction play provides children with a fun way to experiment and practice hand-eye coordination with detailed tools and intricate parts made in wood and plastic.