The classic shape of the Cole & Mason acrylic mill is as popular today as it was when first designed back in 1975. The clear acrylic body allows you to see when the mill requires refilling and a spring loaded mechanism allows you set the level of grind you require - from fine to coarse. Perfect for the dining table or for use in the kitchen. The precision grind mechanism in the pepper mill is made from hardened carbon steel and in the salt mill it is made from diamond sharp ceramic. For your reassurance, both mechanisms come with a lifetime guarantee.