Build your own combination lock box and crack the code of mechanical engineering! This DIY kit teaches kids how combination locks work from the inside out — assembling the disc mechanism, setting a code, and experiencing the satisfying click of a lock they built themselves.
A combination lock opens not by a key, but by aligning a series of interconnected discs to a specific position. Rotating the dial turns each disc until the notched gates align — and the lock opens. Kids experience this mechanism firsthand as they build it from scratch.
Build a real working combination lock box from scratch
Set your own code and learn how the disc mechanism works
Learn mechanical engineering and pattern recognition hands-on
Develops critical thinking, problem-solving, and practical skills
All parts and easy-to-follow instructions included — ages 8 and up
