An Addison Ross Exclusive design, the lacquered bobbin shaped mill comes with both an S and a P stainless steel screw knob so you can decide for yourself whether you want this to be a Salt Grinder or a Pepper Grinder. Using a ceramic mechanism, the mill requires a clockwise motion to activate. The mills can be used for grinding either Rock Salt (Dry Salt Crystals) or Black Peppercorns. Not to be used for sea salt, wet salt, or dried wet salt or pink peppercorns.