The LEGO Technic Heavy-Duty Excavator (42121) is the perfect gift for kids who love construction toys. With realistic features and plenty of creative play potential, this 2-in-1 set offers an immersive building challenge for boys and girls aged 8 and up. Discover how excavators work with the moving shovel, arm, running belts, and rotating body, plus a detailed cabin with a control panel. Use the extra LEGO brick 'stones' and 4 cones for added role-play possibilities. When it's time for a new challenge, rebuild the model into a tracked tractor with backhoe. This set is a great introduction to engineering and is part of the advanced LEGO Technic universe.