SharpStone Vibrating herb grinder is the newest innovation in fine line of grinders. Constructed from premium aluminum, SharpStone grinders produce fine grinds, smooth grinding motion and durability. With a built-in vibrating mechanism, simply press the button to vibrate the tiniest of grinds through the screen to collect in the bottom tray. The razor sharp grinding teeth are utilized by the precision cutting accuracy of the CNC machine. This accuracy will prevent your herbs and spices from being damaged during grinding.