T & G milled 50 kilograms of peppercorns and then in the same mill, a further 50 kilograms of sea salt. The mill continued to work perfectly – equivalent to 400 years of domestic use! The CrushGrind ® millstone and grindstone are made from a special hi-tech ceramic, which is harder than steel. Spiral blades are engineered into the millstone so that the mill produces a closer, smoother and effortless grind. Dimensions: H: 150mm. Material: Clear Acrylic/Stainless Steel Lifetime Mechanism Guarantee Care: Clean with a damp cloth, dry immediately.