Combination Lock Box & Phone Holder DIY Kit

This combination lock box and phone holder DIY kit is a mechanical puzzle you build yourself. A combination lock opens not with a key but when its internal parts line up: turning the dial rotates discs on a central shaft, and each must stop at its notch, or gate, before the lock opens.

Key features

• Build a combination lock box with a phone holder
• 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 you turn the dial makes the whole mechanism easy to follow, and kids enjoy setting and cracking codes once it is finished. A useful desk piece once the build is done. Find more mechanical models.