The grooves reduce drag, making it easier to grate food Features exclusive technology: A grooved, grating that lets you grate more with less effort. The non-slip handle and base provide stability; the grater can handle large amounts of food with ease. The grooves also extend the length of each blade; more food is grated with each stroke For citrus zest and parmesan, coarse for cheese and vegetables, extra coarse for soft cheeses, and slicer for a variety of vegetables.