Microplane makes the very best graters for spices, citrus zests, chocolate and other such things. They are the sharpest, easiest to use, and most durable grater of this type that we've come across.
The Spice Mill is a clever little Microplane product that is perfect for grating small spices like nutmeg, cinnamon, tonka beans, and more. Simply put the spices inside, put in the plunger, and twist to grate. Then unscrew the plunger to store the unused pieces inside. Easy!