This is a small tool for snapping utility knife blades and contain the snapped blades in a safe way. Its a small container with a screw on lid, that has a narrow slit where you can insert the used blade of a utility knife to snap it off. The snapped blade will than drop into the container and can be desposed off later. 

Fits in your pocket and is a must have if utilityknifes are your weapon of choise.

The threads are designed to be printer friendly with the right ammount of tolerance.