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. About BRIO Builder: Feel like an inventor, build anything you want and create a new toy for every day of the week with BRIO Builder – the open-ended construction toy from BRIO. With easy-to-use construction tools, mixed-material parts and the freedom to build anything, hours of creative play and educational experimentation awaits.