Our professional grinders contains an efficient adjustable anti-twist grinding core, which can effectively avoid the core loss and the mixing of ceramic powders. At the top of each salt and pepper mill, you just twist the knob to set your desired coarseness of salt, pepper, or spice to grind. Lift lids in a jiffy, open bottles, and lever or loosen a can lid in a jiffy without injuring your hands. The Can Opener has an ergonomic handle that sits nicely in your hand without slipping or sliding, and has an easy to turn knob that won't hurt your fingers. You just wash the opner by hand after using, then wipe off with cloth and keep it in dry place for long lifespan. It's easy to carry to outdoor picnics, camping, etc.