Ugears "Safe Kit" I DIY Self-Assembly Mechanical Kits For Teens and Adults smiley or reverse with a kinematic

or reverse with a kinematic pair of gears with different ratios and

Number of components: 538

The model has the shape of a compact cube with eight compartments to accommodate a standard dice set

the model runs forward on all four legs

Ugears "Safe Kit" I DIY Self-Assembly Mechanical Kits For Teens and Adults smiley or reverse with a kinematicThis is a real safe with a functional 3 digit combination lock. Build your own safe with a unique lock combination and store your precious things (or candy) in it! An outstanding gift on its own, once assembled, it may serve as a secret gift package, requiring a person to practice some safecracking skills. It is possible to get the right combination by twisting the knob and listening carefully to the clicking sounds (provided the safecracker knows the