The 2-in-1 slicing/grating disc(s) are reversible - this means that one side works as a grater and the opposite side can be used to slice. To grate, ensure that the side with raised grating holes is facing upwards (towards the lid). To slice, ensure that the side with raised grating holes faces downwards (towards the base) and the side with the raised slicing blade faces upwards. Watch this How-To video and learn how to assemble, use and clean the reversible 2-in-1 slicing and grating disc: