Mar 20, 2018· The stainlesssteel and plastic body protect your ceramic grinder from rust, moisture, and corrosion. The ceramic grinder is adjustable, and the adjustment is found at the bottom of the grinder. You can go from fine to coarse with a flick of the wrist. The clear window will let you see when it is time to refill the approx. 9 ½ inch grinder. 10.