1.RUBBER WOOD SALT GRINDER - Made of natural matte black rubber wood, this grinder set is a must addition to any kitchen, camping or picnic. 2.ADJUSTABLE GRINDING SETTING - The stainless steel screw cap can adjust the thickness of the powder. (CLOCKWISE for coarseness, ANTICLOCKWISE for fineness) 3.ANTI-RUST CORE - Ceramic cores are more durable than stainless steel cores and will not rust! 4.FRESHNESS KEEPER - Screw top cap to keep away from moisture, protect your spice in grinder fresh for long time. 5.EASY MAINTENANCE - Hand wash with damp cloth, do not submerge.