Combination Lock Box DIY Kit

This combination lock box DIY kit shows how a lock can open without a key. A combination lock relies on the alignment of its internal parts: turning the dial rotates a set of discs on a central shaft, and each disc has a notch that must line up before the lock opens. Building one makes that mechanism easy to understand.

Key features

• Build your own combination lock box
• Learn how discs, gates and a central shaft work together
• Mechanical puzzle that encourages critical thinking
• Introduces numerical patterns and codes

Specifications

• Recommended age: 8+

Watching the discs line up as the dial turns makes the whole mechanism click, literally and figuratively. A satisfying build that also gives kids a place to keep small treasures. Find more mechanical models.