XHHOME Oak Wood Pepper Spice Salt Mill Stainless Steel Core 5" Make freshly ground pepper/powder/spice. Wonderful pepper mill designed with metal grinding mechanism Suitable for milling pepper, pickly ash, corn, mustard seed and other small sized spices Material: Oak shell, stainless steel grinding mechanism Instruction: Screw up the screwcap at the top of the mill to adjust the thickness of pepper/spice you are going to grind. Screw up the screwcap tightly to make it fine, and vice versa.