This is a tool for squeezing out the contents of tubes that are running low. The S size is for tubes with relatively soft containers, such as toothpaste. The M size is suitable for harder or thicker containers, such as face wash or shaving gel. To use it, insert the end of the tube into the middle bar, then simply turn the handle click by click. To remove it, pinch the tip and slide it down slightly to release the lock. Compatible size: Tube width up to approximately 8 cm.